Estimated date of birth(PDR) is considered the day when the gestational age is exactly 40 weeks. Although a full-term pregnancy is considered already after reaching the full 37 weeks, and in some cases a healthy full-term baby can be born at 42 weeks of pregnancy, it is still customary to focus on 40 weeks, since most births begin at this time.

Importance of Calculation estimated date the birth of a baby is beyond doubt, and the point here is not only the desire of parents to prepare for the appearance of a new family member. The medical side of the matter is also important. We list the reasons why the doctor leading the pregnancy needs to know the expected date of birth.

Growth and development of the fetus. It is important for a doctor observing the course of pregnancy to know how the developing baby corresponds in size to the gestational age (which is calculated based on the expected date of birth) in order to timely diagnose such a serious complication as intrauterine growth retardation (IUGR), which is a consequence of placental insufficiency (pathology , in which the placenta inadequately performs the functions of providing the fetus with everything necessary for growth and development). Timely adequate diagnosis and, consequently, the treatment of this complication is of great importance for the further full development of the baby.

Prevention of pregnancy complications. In the process of observation, the obstetrician remembers that certain complications may develop at various stages of pregnancy, and therefore, the terms are determined in which it is necessary to carry out diagnostic measures to identify complications, their prevention and treatment (for example, prenatal screening - diagnosis congenital malformations of the fetus - should be carried out at clearly defined terms of pregnancy, and if these terms are not observed, its diagnostic value is sharply reduced). In diseases such as diabetes mellitus and hypertension, for example, if the course of the disease worsens or treatment does not give a positive effect, it may be necessary to deliver before the spontaneous onset of labor. Then the doctor needs to know in order to ensure the maximum possible degree of fetal maturity in this clinical situation.

When to go to the hospital

If there are indications for early hospitalization before delivery, it is important to correctly determine the timing in which the pregnant woman should go to the hospital. After all, with too late hospitalization (for example, on the eve of a planned cesarean section), there is a risk of not having time to carry out the necessary amount of examination and preparation for delivery, and too early hospitalization is not advisable, since a long stay of a future mother in a hospital can lead to an increased level of anxiety, stress on the eve childbirth. Terms of antenatal hospitalization for various complications during pregnancy may vary. For example, with diabetes, it is necessary to hospitalize a pregnant woman no later than 36 weeks. With the transverse position of the fetus and placenta previa, the expectant mother should be in a hospital no later than 37 weeks (since during this period the processes of preparing the body for childbirth begin, which is very dangerous due to prenatal rupture of amniotic fluid in the case of a transverse position of the fetus and the development of bleeding during presentation placenta). Women with breech presentation and anatomically narrow pelvis are sent for antenatal hospitalization at 38–39 weeks of gestation in order to have time to conduct a complete examination, choose the method of delivery, and prevent pregnancy from being overdue.

How to calculate due date

For determining estimated date of birth several methods are used.

obstetric term(according to the date of the last menstruation). It is generally accepted to consider the date of the reference of the menstrual cycle as the date of the first day of the last menstruation - that is, the full menstrual cycle is calculated as the interval from the first day of menstruation to the first day of the next menstruation.

For calculation estimated date of birth By the date of menstruation, there are two ways:

280 days are added to the date of the first day of the last menstruation (pregnancy has such a duration, counting from the date of menstruation).

Negele formula: 3 months are subtracted from the first day of the last menstruation and 7 days are added. For example, the last menstruation was May 10 - subtracting 3 months, we get February 10, and adding 7 days, we get February 17 - this will be the expected date of birth by the date of menstruation (we will assume that on February 17 the gestation period will be a full 40 weeks, and therefore, around this time, labor should begin).

Embryonic term(by date of conception or ovulation). The probability of pregnancy is maximum on the day when ovulation occurs - the process of the release of a mature egg from the ovary. This usually occurs in the middle of the menstrual cycle (for example, if the menstrual cycle is 28 days, then ovulation occurs on the 14th day, and if the cycle is 32 days, then on the 16th day).

Considering that the egg is capable of fertilization within 24 hours after ovulation, and the life expectancy of the sperm is on average 72 hours (in some cases it can reach 4-5 days), the probability of fertilization is not 1 day, but much earlier - starting from 9 -10th day of the menstrual cycle (with a 28-day cycle). This circumstance greatly complicates the establishment of the expected date of birth by the date of conception. It is possible to set the due date for conception in cases where a woman knows exactly the date of ovulation (for example, she monitored basal temperature or, for medical reasons, ultrasonic monitoring of folliculogenesis, the process of egg maturation, was carried out). To determine the PDR, 266 days are added to the date of conception (since this is the true duration of pregnancy) or 38 weeks.

With a regular menstrual cycle (lasting 28 days), there is no difference between the calculations by the date of the last menstruation and the date of conception, therefore it is most convenient and informative to determine by the date of menstruation.

By date of first appearance in women's consultation. This method of determining the duration of pregnancy and childbirth will be as informative as possible if the expectant mother consults a doctor before 12 weeks of pregnancy. When registering, in order to verify the fact of pregnancy and establish its duration, the doctor will examine the gynecological chair to determine the size of the uterus. It begins to increase from 5-6 weeks of pregnancy, acquires a spherical shape. In addition, during pregnancy, the uterus becomes soft (outside of pregnancy, the uterus has a pear-shaped and dense texture).

Determining the size of the uterus during a gynecological examination, the doctor specifies which gestational age corresponds to an increase in the uterus. For example, at 5-6 weeks, the uterus becomes the size of a chicken egg, at 7-8 weeks - with a goose egg, by 12 weeks it reaches the size of a newborn's head and its bottom (the so-called upper part of the uterus) can already be palpated (palpated) through the anterior abdominal wall without resorting to vaginal examination. Starting from the second trimester, according to the height of the uterine fundus, one can approximately determine the gestational age: by 16 weeks, the uterine fundus is in the middle of the distance between the womb and the navel, by 24 weeks - at the level of the navel.

It is important to remember that the longer the gestational age, the higher the error in its determination by this parameter can be, since the height of the uterine fundus depends on many individual characteristics: the number of births in history, the size of the fetus, gynecological diseases (for example, with uterine myoma, the size this body will be more than the norm for a given period), the anatomical features of the body of the expectant mother, etc. Therefore, the examination performed before 12 weeks of pregnancy is of the greatest importance for determining the ED by attending the antenatal clinic - then the doctor will be able to determine the gestational age by the size of the uterus .

According to ultrasound. Determination of gestational age and estimated date of birth it can be done quite accurately if an ultrasound scan is performed in the first trimester of pregnancy (up to 12 weeks). When conducting an ultrasound examination at the earliest possible time (and it is possible to see the fetal egg by ultrasound from 3-5 weeks of pregnancy, the embryo begins to be clearly visualized a little later - starting from 5-6 weeks of pregnancy), the average inner diameter of the fetal egg and the coccygeal-parietal size are measured KTR of the unborn child. For each gestational age, there are certain KTR standards, measured in millimeters, by comparing which with the data obtained, it is possible to accurately determine the expected date of birth.

In the second and third trimesters gestational age is established based on the measurement of certain dimensions of the fetus: such as biparietal size (the distance between the parietal tubercles, or the large transverse size of the fetal head), head circumference, abdominal circumference, diameter of the thorax and abdomen of the fetus, length of the femur. The data obtained also make it possible to judge the gestational age, but it must be remembered that the larger it is, the greater the likelihood of error. This is due to the fact that as the fetus develops, depending on the characteristics of the course of pregnancy, the presence of maternal diseases, hereditary factors, the size of the fetus, by which the gestational age is judged, will vary significantly. One mother will have a child weighing 2600 g and 48 cm tall, while the other will have 4500 g and a height of 57 cm, which is completely normal, since all people have individual anthropometric characteristics. Thus, it is possible to determine the gestational age as accurately as possible according to ultrasound data in I trimester of pregnancy or around 20 weeks, when there is the greatest match between fetal size and gestational age.

By date of first movement fetus. PDR can also be determined by such a parameter as the date of the first fetal movement. In this situation, it is more correct to talk about the date when the pregnant woman first felt the fetal movements, since the fetus begins to actively move in the uterus from 8 weeks of pregnancy, the mother simply does not feel this due to the baby being too small. It is believed that primiparous women for the first time feel fetal movements on average starting from 20 weeks of pregnancy, and multiparous women - from 18 weeks, therefore, to determine the expected due date for this parameter, 20 weeks are added to the date of the first fetal movement in primiparas, 22 weeks in multiparous.

It should be noted that this method DA definitions It is considered additional, or auxiliary, since fetal movements are a very subjective feeling, and besides, expectant mothers do not always celebrate it for the first time in the above terms. For example, primiparous women may first feel the movements of the fetus in the later stages of pregnancy - after all, this is still an unfamiliar sensation to them, and at first they may confuse it with intestinal motility or simply not notice it. Women with a pronounced layer of subcutaneous fat may first feel fetal movements 1-2 weeks later. Multiparous women, on the contrary, can notice the first movements at an earlier date (at 16-17 weeks), as they already know how it happens. These circumstances may reduce the accuracy of determining the expected date of delivery by the date of the first movement of the fetus.

What for calculate the DA in multiple settings?

The need to calculate estimated date of birth by several methods simultaneously due to the following factors. First, despite the availability of state-of-the-art methods for estimating gestational age, it is almost impossible to predict when a woman will go into labor (within the accuracy of the day). Secondly, some of the data used to calculate the estimated date of birth may be uninformative for various reasons. For example, with an irregular menstrual cycle, the calculation of the EDD by the date of the last menstruation will not be accurate, and with a late first appearance at the antenatal clinic, the presence of gynecological diseases (uterine fibroids) or overweight, it will be difficult to determine the gestational age by the size of the uterus. Given these circumstances, the doctor sets the expected date of birth according to the maximum amount of data to clarify the time interval in which the birth is most likely to begin. As a result estimated due date most often defined not as one specific number (for example, January 15), but as a time period (for example, from January 12 to 17).

Nevertheless, even in the estimated term, which is correctly calculated according to all the data, far from all pregnant women begin, since the duration of pregnancy in each case depends on many factors. That is why the date of birth is called the estimated date.

Length of pregnancy, and therefore the period when regular labor activity develops, are individual, moreover, it is calculated based on the fact that childbirth will begin upon reaching the full 40 weeks, but the pregnancy is considered full-term after 37 weeks, so childbirth can begin in 2-3 weeks before the expected due date. A variant of the norm is the development of labor activity in the 41st week of pregnancy.

Thus, on duration of pregnancy and the date of delivery are influenced by many factors, among which an important role is played by the characteristics of the anamnesis - the age of the expectant mother, the number of previous births, the presence of miscarriages, premature births and / or abortions in the past, existing chronic diseases. In addition to these features, for a period onset of childbirth also influence the course of this pregnancy. For example, in a multiple pregnancy, childbirth often begins earlier than in a single pregnancy, and the gestation period is inversely proportional to the number of fetuses (the more fetuses, the shorter the period), which is due to overstretching of the uterus. With the development of placental insufficiency (pathology of the course of pregnancy, in which one or more functions of the placenta are disturbed, leading to insufficient supply of the fetus with everything necessary for growth and development), both the early development of labor and an increase in the duration of pregnancy by 1-2 weeks are possible.

Despite the impossibility of absolutely accurately determining the date of birth, it is still necessary to correctly calculate the EDD. Focusing on the expected term of delivery, the degree of biological readiness of the body of the future mother for childbirth (determined by the doctor according to a number of signs, one of the main ones is the degree of maturity of the cervix - the presence of biological readiness for childbirth is the key to the physiological course of childbirth and a favorable outcome for the mother and fetus) and the condition fetus, the doctor will be able to timely resolve the issue of the need for preparation for childbirth, prenatal hospitalization, drug treatment, etc.

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If you want to know how to calculate the due date, then it is here that you will find answers to all your questions about this. You can calculate the date of birth by the date of conception, as well as by the last menstruation. If you have access to the Internet, then you can calculate the moment of the birth of a child online for free.

If you do not really trust the online calculator, you can calculate the approximate date of birth yourself, guided by special formulas. We will also talk about them in this article. The exact date of birth is difficult to calculate, since the child himself decides when he will be born. So, let's talk about everything in order. How to calculate the date of birth so that it exactly coincides in the future with the birth of a child.

due date calculator

Determining the due date: What are the ways to determine the approximate due date?

So, you took a pregnancy test and it came out positive. Now we calculate the moment of birth of the child. The date of birth is considered differently. There are several ways. We will talk about all of them. Let's first list the possible options for calculating the approximate date of birth. Here they are:

1. you can determine the date of birth both online and without the Internet by the date of conception;
2. you can calculate the date of birth by the last menstrual period.

Both of these methods can be used together. They do not exclude each other. The most correct option for calculating and calculating the upcoming birth and gestational age in weeks, as well as the size of the fetus, is, of course, ultrasound diagnostics. With the help of it, gynecologists determine the most accurate moment of the birth of a child. He will also determine whether you yourself will be able to give birth or you will need to do a caesarean section if the size of the fetus is large or the baby lies incorrectly. He will also explain who assigns and pays a woman child care benefits during maternity leave (employer or FSS). But we will talk about those methods for determining the date of birth and gestational age, for which you do not need to leave the house and even get up from your favorite sofa. After all, you can find out everything using the Internet.

How to calculate childbirth by date of conception?

To calculate the expected moment of birth of a baby by the date of conception and determine the gestational age in weeks, you must have a regular menstrual cycle and know when ovulation occurred. After all, conception is possible only during ovulation. Well, we are not even talking about what else you need to remember the day on which there was intimacy with your loved one. It's obvious. If, suppose, most women have 28 days of menstruation, then ovulation, as a rule, occurs on the 14-15th day.

But it is worth noting that the conception of the fetus might not have occurred on the day of sexual intimacy. It has been noticed that spermatozoa are able to live even for 3 days, “walking” while inside a woman. Therefore, here the approximate moment of the birth of the fetus by the date of conception will be determined approximately, and not day by day. The error can be even one or two weeks. So, now you need to add 280 days to the day of conception (this is exactly how much the average pregnancy lasts for most women). So you calculate and determine the date of birth at conception and the gestational age in weeks. It's pretty simple if you have a regular menstrual cycle and a good memory.

If you don’t want to bother yourself and want to immediately determine the day of your birth by conception and the gestational age in weeks, then use a special calculator on our website for this. Here it will be enough just to enter the estimated day of ovulation in the table and click the "Calculate" button. The computer will calculate and give the gestational age in weeks and the date of birth. As a result, you will know when the baby will appear and will look forward to this day and will no longer look for the answer to the question "How to determine the date of birth by conception." This is a kind of fascinating fortune-telling that gives a correct prediction.

How to calculate the exact date of birth by menstruation and find out what week of pregnancy you are?

To calculate and find out the most accurate date of birth by menstruation, that is, to find out when we give birth, you should also have a regular menstrual cycle. The formula for calculating the moment of birth of a child based on the last menstruation of a pregnant woman is used in their practice by all gynecologists. They will certainly ask the future mother who came to see them about the first day of the last menstruation. There are probably no such pregnant women who were not interested in the first day of the last menstruation by gynecologists.

So, we calculate the approximate birthday of your child and find out how to determine the date of birth by the last menstrual cycle (by its first day). In order to start calculating the preliminary day of childbirth, from the first day of the last menstruation, you must count three months ago, and then add seven days. So it turns out the approximate day of the birth of a child.

If you don’t want to count in your mind, you can calculate the moment of birth of the baby using an online calculator, which, after entering the data, will give you the due date and which week you are automatically. To do this, simply enter the first day of the last menstrual cycle in a special calculator window, as well as the average duration of menstruation and the duration of the luteal phase (for most women, it lasts two weeks, that is, 14 days). Next, click the "Calculate" button and wait for the results of the online test. Almost every woman used such a calculator. It is popular at the moment.

Now you know how to calculate the due date, the calculator will always help with this. And also, now it’s not a problem for you to find out the duration of your pregnancy in weeks and even days. We hope that you will make the calculation correctly and without much difficulty and with great pleasure and in the future make sure that the actual day of the birth of the child coincides with the one given by the calculator! In the future, the question “How to determine the date of birth online” will not arise for you. Read about how to determine the date of birth by ultrasound and fetal movements, as well as how to bring the date of birth closer and get pregnant using IVF in other articles on our website.

SUPPLIED
DATE OF DELIVERY

FIRST DAY
LAST PERIOD

Last day of menstruation: Estimated due date: Left before delivery: Zodiac:

The gestational circle is a convenient and simple tool for determining the gestational age, the expected date of delivery, as well as some other information about pregnancy. Our gestational disc allows you to determine not only the gestational age, date of birth, but also the height and weight of the fetus, and even the zodiac sign of the future child.

Using our gestational circle is very simple.

If you don't know how old you are, scroll the inner circle so that the green arrow points to the first day of your last period.

green arrow

Wherein arrow "today" will indicate today's date and week of pregnancy, as well as the height and weight of the fetus. Then arrow PDR indicate the expected date of birth.

arrow "today"

If you already know your deadline, then scroll the inner circle so that arrow "today" indicated the week of your pregnancy. Then it will also indicate the height and weight of the fetus, and arrow PDR will indicate the expected date of delivery. In this case, the green arrow will point to the first day of the last menstruation.

arrow PDR

See also:

The easiest and most accurate pregnancy calculator: how to use the gestational circle

From school biology lessons, everyone knows that it takes a woman 9 months to bear a fetus. However, this is a very average value that is not used in obstetrics and gynecology. Doctors monitor by weeks and trimesters. But even these figures cannot be called absolutely accurate. The period from the beginning of the last menstruation directly to childbirth takes an average of 40 weeks or 10 obstetric months. A gestational disc will help you find out the date of birth at the beginning of the last menstruation and track changes.

What does "gestational" mean?

Many hear this word for the first time in a antenatal clinic. The Latin gestatio literally translates as "bearing." Therefore, "gestational" means "pertaining to pregnancy."

Gestational age is calculated from the moment of conception. Determining exactly when this happened is extremely difficult. It may take up to several days for a fertilized egg to implant after intercourse. At the initial stage of embryo development, even a few hours play an important role. Therefore, the inaccuracy in the definition of the "starting point" leads to a relative conditionality of the calculation.

Gestational disc for determining due date

There are different calculators, the main purpose of which is to establish the date of the baby's appearance. Gestational circle- an indispensable tool for preparing for childbirth and better control of the pregnancy process. With its help, every woman can determine the "X date" at home. This is necessary, since premature and late births pose the same danger. Therefore, it is important to calculate the expected day of delivery and, as it approaches, carefully monitor the signals of the body.

Statistics say that about 2% of babies are born on exactly the calculated day. The date that the calculator will show is better considered conditional. Most likely, the baby will be born a few days earlier or later. Normal childbirth is considered between 38 and 40 weeks. But each organism has its own unique characteristics. Some women live up to 42 weeks, in which case maximum attention from doctors is required.

The gestational circle is one of the most informative calculators. In addition to the estimated date of birth, it can be used to determine the height and weight of the embryo as it develops. In addition, many parents are interested in what sign of the zodiac and in the year of which animal according to the eastern calendar a child will be born. For some couples, it helps to choose a name.

How is the gestational cycle

With this visual calculator, it is easy to determine the due date and track the height and weight of the fetus during pregnancy. The outer disk is divided into 12 months. Each day corresponds to one division on the scale. For convenience, long marks are indicated every 5 days.

The numbers 1-40 on the moving part of the disc correspond to the weeks of pregnancy. Also, using a background with different saturation, trimesters are highlighted: the first - from to , the second - from to , the third - from to . Closer to the center is the scale of weight, and at the last level - the growth of the fetus.

There are 3 arrows on the circle: green thin (first day of the last menstruation), EDD (estimated date of birth) and a static “today”. In the center of the circle, basic information is displayed: the beginning of the last menstruation, the expected date of birth and the baby's zodiac sign. In the area under the disk, the number of weeks and days before childbirth is instantly calculated, as well as zodiac characteristics.

How to use a gestational disc to determine the gestational age

The gestational circle is used by many obstetrician-gynecologists in different countries, including Russia. The simplicity of the method allows it to be used by absolutely every woman.

When planning a pregnancy, it is especially important to keep a menstrual calendar. This will help to determine the expected date of birth as accurately as possible. To calculate the gestational age according to the gestational circle, it is enough to move the thin green arrow to the date of the start of the last menstruation. The PDR arrow will indicate the date of delivery, provided that the pregnancy ends at 40 weeks. Using the “today” arrow, it is easy to track the average height and weight of the fetus for each week.

For example, the last menstruation was from 12 to 16 December. For the calculation of the gestational circle, only the first date is important - December 12. Set the thin green arrow to this number. Twisting the arrow, pay attention to the center of the circle. This is much more convenient than peering into divisions. The “today” arrow indicates that the woman is at the beginning of the 8th week of pregnancy, the fetus has grown to 18 mm and weighs 1 g. You need to prepare for childbirth within 1-2 weeks from September 18th.

What should a woman do if she does not know the date of her last menstrual period?

To independently determine the date of birth of a child in this case, the gestational circle will be ineffective. Usually, doctors prescribe a blood test for hCG. Chorionic gonadotropin is a hormone that is released in the body of a woman after implantation of the embryo in the uterus at 4 obstetric weeks. From this point on, you can get the most reliable results.

When using the strip test at home, the second strip may be translucent. This indicates either the unsuitability of the test, or a small amount of the hCG hormone in the body. To obtain reliable results, you need to try again in a week if menstruation does not begin. A weakly pronounced second strip can appear in women taking hormonal drugs, regardless of pregnancy.

A home test only shows the presence of pregnancy. According to the result of a biochemical blood test, its duration is determined. Don't put off checking. Analysis for hCG is most reliable in the first 12 weeks. Gradually, the level of the hormone decreases, and at a later date it is difficult to determine the time of conception.

When the week of pregnancy is known, the gestational circle can be used to calculate the date of delivery and determine the size of the fetus. To do this, just set the “today” arrow to the mark corresponding to the current date.

For example, it's week 9. At this stage of development, the embryo has reached 23 mm and weighs 2 g. The expected date of birth is September 9. The green arrow indicates the approximate date of the last menstrual period.

Errors

Bearing a fetus is a complex process that each woman proceeds in a special way. Moreover, the course of the first pregnancy does not mean that the next ones will follow the same scenario.

The pregnancy calculator allows a certain error. In addition, when setting the initial data, errors are not ruled out. The accuracy of the calculation depends on the individual characteristics of the organism. The pregnancy wheel shows the most accurate result with a standard menstrual cycle of 28 days. If the duration is longer, for example, 35 days, then ovulation will occur on average on the 21st day. This leads to an increase in the difference between obstetric and embryonic terms.

In addition, the error can be provoked by inaccuracy in determining the embryonic period. The spermatozoon is able to remain in the female body for up to 3 days. Fertilization can occur at any time. Taking into account all factors, including the individual characteristics of the body of the expectant mother, the error in calculating the expected date of birth often reaches 2 weeks. Ultrasound gives more accurate results, although the method of calculating the beginning of the last menstruation is recognized worldwide as one of the best.

Why in the first two weeks the height and weight on the disk correspond to zero

You can see that in the first two weeks the indicators are zero. However, this period is part of the entire pregnancy cycle. The fetus in the womb develops surprisingly quickly. Therefore, in determining the date of birth, every day is important. At the same time, there are different terms - obstetric and embryonic, which are important not to be confused.

Some mistakenly believe that the first week is counted from the moment of conception. In fact, pregnancy begins on the last day of the menstrual cycle. Directly during this period, the birth of a new life could not occur. The moment of conception depends on ovulation and varies within a couple of weeks.

With a standard menstrual cycle of 28 days, ovulation occurs on the 14th day. In this case, the embryonic period will lag behind the obstetric period by about 2 weeks. In practice, this means that at the end of the first month of pregnancy, the actual age of the embryo is only 2 weeks.

Why sometimes calculations by different methods do not match

Many women are surprised to find that the dates of birth according to various calculations do not match. Which one to believe?

In official medicine, it is believed that embryos develop in the same way during the first trimester. On ultrasound, the gestational age is determined according to the table of correspondence between the size of the fetus and a certain period of development. For example, the calculation for the last menstruation shows the result of 12 weeks, and the diagnostician calls 11 weeks. More reliable is considered to be the period set during the first ultrasound. In this example, the difference is due to early ovulation, but it can be late. For the doctor, the result of an ultrasound examination is a priority.

During the second and third trimesters, each fetus develops at its own pace. Therefore, the data from the averaged tables may not fully correspond to reality. Deviations within one week are considered normal. In the ultrasound protocol, the specialist indicates what period the development of the fetus corresponds to.

The gestational circle gives an idea of ​​how the unborn child develops every day. At the beginning of the first trimester, the embryo gains only a couple of grams every week, but the difference, for example, between and 21 weeks is an average of 71 g. It is interesting for every woman to know how the fetus changes. With the gestational circle, observation becomes simple and even more fun.

The most important weeks of pregnancy

In order for the fetus to develop correctly and the child was born healthy, the fact of pregnancy must be established as early as possible. It is not at all necessary that the expectant mother will intuitively feel the conception, or from the first weeks obvious signs will appear in the form of a heightened sense of smell, morning sickness, etc. It is not uncommon for a woman to find out about pregnancy only by her enlarged belly.

For pregnant women, the following factors are of particular danger:

• Unhealthy habits.
• Stress.
• Unbalanced diet, deficiency of nutrients (mainly iron and folic acid).
• Great physical activity.
• Overheating or hypothermia.
• Taking medications that are incompatible with pregnancy.
• Infectious and inflammatory diseases.

It is necessary to prepare the body for pregnancy in advance in order to minimize the risks for the fetus and the expectant mother. But even if everything goes according to plan, there are times when extra care must be taken. If at any stage of pregnancy a woman feels severe discomfort, burning, or even unreasonable anxiety, you should visit a doctor.

When to be extra careful

Critical periods coincide with the phases of active growth of the embryo and placenta. The most dangerous weeks are the following:

• I trimester - 2-3, 4-7, 8-12.
• II trimester - 18-22.
• III trimester - 28-32.

The insidiousness of the first weeks is that a woman may not be aware of pregnancy. As a result, the prerequisites are not met. From 4 weeks, the main organs are formed. During this period, it is especially important to follow the doctor's instructions in order to prevent pathologies. At the last critical stage of the first trimester, the placenta is formed - a natural shield that will increase with the fetus.

The period from to 22 weeks is considered the most important. At this time, the unborn baby is most active. The biggest risks to the life of the fetus and the health of the woman are sexually transmitted infections. One of the main conditions is to use barrier protection during sexual intercourse.

By the beginning of the third trimester, the fetus is as similar as possible to a baby, but it is not yet able to survive separately from the mother's body. Causes of preterm labor may include placental abruption, infections, and isthmic-cervical insufficiency. To prevent this, you need to follow absolutely all the doctor's instructions, take care of your own health and eliminate stress.

There are no critical periods on the gestational circle. This is due to the fact that they do not have to be difficult at all. The more you focus on the dangers, the stronger the destructive effect of stress. You can use the pregnancy wheel during the entire period of gestation. On the diagram, it is convenient to track the transition to a new trimester, the stages passed and the approaching date of birth.

Description

The universal pregnancy calculator is a convenient and practical tool for calculating a number of parameters that are important and interesting for a future mother. The calculator is a circle, similar to a watch dial, the inside of which can be rotated, setting one or another hand in the desired position. For example, by setting a thin green arrow so that it points to the first day of the last menstruation, you will determine the date of future births by the arrow "PDR", and by the arrow "today" you will find out what week of pregnancy you are now, and what is the height and weight of the fetus on present day. The Pregnancy Wheel can also be used in other ways. For example, if the birth has already taken place, then you can set the arrow "Ed" (estimated date of birth) so that it points to the day of delivery. Then a thin green arrow will show you the date on which you had your last period before pregnancy. Among other things, the calculator determines the zodiac sign of the unborn child, and even his zodiac animal according to the eastern calendar.

Finding out the date of birth by the date of conception is very simple if there are no hormonal disruptions in the woman’s body and the fetus is healthy. Also, by this date, you can almost certainly find out the gender of the expected child. Scientists have not figured out how this table works, but ninety percent of the time it tells the truth. How to find out the date of conception? Every woman should know and be able to do this, because it is extremely important. We suggest that you familiarize yourself with the methods that will help establish the truth.

Date of conception: what is it?

This is the day when the male (sperm) and female (ovum) germ cells merge. This is possible at the time of ovulation, when the female cell enters the abdominal cavity from the ovary, but the duration of this period is extremely short, it lasts only two days. Pregnancy can occur precisely in these two days or 2-3 days before, but after that it is already impossible. The fact is that spermatozoa can exist in the female body for up to three days, and the likelihood that one of them will wait in the wings is extremely high.

Why do you need to know the date?

This is extremely important to know, as you can find out the gestational age. According to the date of conception, doctors can set a more accurate date of birth, and future mothers, using the plate, which we will present in the future content, will determine the sex of the baby in advance. You need to know the date in order to undergo the necessary examinations, which are done on certain weeks. In addition, in the first weeks of pregnancy, the fetus is very vulnerable, and during this period it is necessary to adhere to proper nutrition and a healthy lifestyle.

How to find out the date of conception, any girl should understand. Pregnancy is not always planned, and situations arise when a woman decides to terminate it. It is important to perform the procedure before seven to reduce the risk of complications and side effects.

Since the calculation of the day of conception directly depends on the day of ovulation, the calculation rules will be useful to those women who plan to have a baby. Using the calculator, you can definitely find out the most suitable day for intimacy to get pregnant or, on the contrary, avoid it.

Finally, knowing the date is important when paternity disputes arise. Of course, you can take DNA tests, but this is an expensive procedure, and both the baby and the father are needed for it, and the second one may not always be present.

How to understand if pregnancy has come?

If your period is absent (you have a delay), this may be a sign of a conception that has occurred. Before the onset of the delay, you can take a blood test, which will show the amount of chorionic gonadotropin, a hormone that increases sharply in the presence of pregnancy.

If there are no periods, then a test is purchased. The presence of a negative answer does not guarantee the absence of a fetus, it’s just that the test may be defective, or your term is still too short, and the hormone has not had time to develop in the right amount.

If the tests consistently show a negative result, contact the antenatal clinic to see a gynecologist, you may have a hormonal failure.

We calculate the day of fertilization according to the menstrual cycle

You can find out the date of conception by menstruation, but it will not be the most accurate, since the calculation of the period is from (the beginning of) the last menstruation. Not the fact that it was then that you could get pregnant. Fertilization could occur before (and this happens, but rarely) or after the last menstruation. So, if you judge by menstruation, as doctors do, then the period is counted from the first, but not the final day of the last menstruation. Subtract three months from this date, add seven days, so you can find out the expected day of birth. It will also not be accurate, since everyone has different cycles, and the date of conception is still in question.

We are planning a pregnancy

The calendar of the menstrual cycle should be maintained by every girl, regardless of the presence of sexual intercourse in life. The calendar will help track delays, which may indicate not only the presence of pregnancy, but also hormonal disruptions.

The calendar can help you calculate the optimal periods for conceiving a child. As a rule, ovulation always occurs in the middle of the MC, which is calculated from the first day (beginning) of the last menstruation to the first day of the upcoming one and ranges from 28 to 30 days. Accordingly, we choose the middle for conception - three days, two of which will definitely be the dates of ovulation. The rest of the days before and after it are considered "useless", but still there have been many cases when pregnancy occurred precisely in those periods, so it is not recommended to use the calendar for "safety".

The calendar will help plan the baby's gender. As a rule, girls are born after intimacy, which occurred a couple of days before ovulation. Male cells during this period are already less active and remain the most enduring and strong, which guarantees the female gender. If sexual intercourse occurred on the days of ovulation, then there will be a boy, because the egg will be fertilized not by the most hardy, but by the most active.

Electronic test

How to find out the exact date of conception if you have an irregular cycle and you are at a loss? A convenient, relatively new development will help - an electronic test. How to find out the date of conception of a child using this device? Using it is extremely simple, just like a regular test, which indicates only stripes. The electronic test will indicate an approximate, but still quite truthful period, just subtract the number of days, and a more accurate conception date will be determined. Look at your cycle in your calendar, "try on" the date calculated using the test, and correct the calculation by shifting the number to the day of ovulation.

Ultrasound procedure

Finding out the date of conception by ultrasound is quite difficult, since this procedure is only necessary to confirm the obstetric "verdict". You do not care for the day of conception, the day when the last menstruation began.

It is easy to find out the due date by the date of conception. Setting the date of birth is much more difficult, it is calculated based on many factors. This is an obstetric assumption of the day of conception, forty weeks are counted from it. The baby can be born on the 37th, and on the 42nd, and on the 28th week. An ultrasound will also not indicate the reliable timing of childbirth, only the period in which the baby is supposed to be born. Also, the weight of the fetus, the first stirring and many other factors are taken into account.

Is it possible to find out the date of conception by date of birth?

When the baby has already been born, you can find out, again, the estimated date of conception. Why is it necessary? Many people want to know this just for the sake of curiosity, but for some it helps in determining paternity.

So, from the date of birth, remove a week, add three months. Add two weeks to the result. This will be the estimated date of conception, and you can verify the correctness of your belief about the father or refute it.

So, we got acquainted with the methods of how to find out the date of conception. Is it possible to determine the gender of the unborn baby from it? How to plan the birth of a son or daughter, focusing on the days of ovulation?

How to find out gender?

On the Internet, on the advice of friends and relatives, many couples want to know the sex of the child. By the date of conception, by blood type, by the postures used - there are no methods! To trust them or not is a purely personal matter, but you can still try. It is easier to find out the sex of the child by the date of conception; for this, tables were created by the sages of the East. Some of them, such as the Chinese one, are more than seven centuries old and are kept in museums. You do not need to go to Beijing to look at this plate, we bring it to your attention in this publication.

How to find out the sex of a child by the date of conception: a table from China

This plate will help plan the sex of your child or determine it before an ultrasound. The top numbers - the month of conception, going from top to bottom - the age of the expectant mother. Letters at the intersection - the value of the floor. To use the table correctly, you need to add nine months to your age, because the Chinese consider it not from birth, but from the month of conception.

How to find out the date of conception, we already wrote, it is not a specific day that is important here, but the month in which ovulation took place and fertilization occurred. Accordingly, in order to find out in advance who will be born, to plan it, this table will help, because you can never be one hundred percent sure that conception has occurred or will occur on a particular day.

Possible table errors

Many couples plan everything, and pregnancy is no exception. It is important for parents that the baby is born in summer or winter, and therefore they choose the date of his conception themselves. It doesn’t matter to many whether it will be a son or a daughter, but still there are people who intend to give birth to a baby of a certain gender. This may be due to the fact that there are already three sons, and I want to finally braid my daughter's pigtails and buy her elegant dresses. You cannot trust the table one hundred percent, and now we will tell you why.

It is easy to find out gender by date of conception with a table if your ovulation occurs in the middle of the month or at the end. If it happens in the first days of the month, then there can be a huge difference. As we already wrote, male reproductive cells are able to live in the female uterus for up to several days. If sexual intercourse occurred in the last days of the month, and not in the first, then there is a high probability that fertilization will occur as early as next month.

Parents can find out more accurate information about the baby's gender from the results of an ultrasound scan, but this study can sometimes give incorrect information.

Grandma's method to recognize gender

Older people are able to determine the sex of the unborn baby, just by looking at the mother. They say that girls take beauty away, and boys add it! If you have pimples, the contours of your face are blurred, then most likely you will give birth to a daughter. If the skin has become healthier in appearance, acne has disappeared, the contours of the face have become clearer, then wait for your son!

You can also look at the belly. Boys live in stretched forward, even bellies. If you look at the expectant mother from the back, then the pregnancy will be invisible, as the whole belly leaned forward. The girls distribute the tummy on the sides, it does not protrude much forward, but spreads well on the sides!

You can also follow your desires. Boys are less whimsical, and you will not want to taste fresh watermelon in the middle of winter, and even at night. This is for an example. If you notice that there is a need to eat something that you usually did not eat, you can assume that you are expecting a daughter.

We hope that this publication will not only be interesting, but also useful. We wish you and your little ones great health, and this is more important than gender!

Enter the first day of your last menstrual period

Day

Month

Year

Day

Month

June 2018

Alleged
Conception date

days before delivery

September 2018

Alleged
date of birth

June 2018

Alleged
Conception date

days before delivery

September 2018

Alleged
date of birth

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Calculation of the date of birth by the date of conception

On average, gestation (“interesting position”) in women lasts two hundred and eighty days from the moment of ovulation.

280 days is ten obstetric months. Or forty obstetric weeks. Plus, the first two obstetric weeks before ovulation from the first day of the last menstruation. In this case, ovulation occurs on the fourteenth day of the woman's menstrual cycle. That is, knowing the date of the first day of the last menstruation, add fourteen days to it, and then add another two hundred and eighty days, and you will get the estimated date of birth (DA). Spermatozoa can live up to three days. Therefore, when we try to determine the date of birth from the date of conception, we do not take as a starting point the day of conception, or sexual intercourse, on which conception is most likely to occur. The starting point is the day of ovulation.

Determine due date from last menstrual period

Negele formula - subtract 3 months from the first day of the last menstruation and add 7 days.

Much depends on what menstrual period the expectant mother has. If it is less than twenty-five days, the baby may be born a week or two ahead of schedule. If the expectant mother's menstrual cycle is more than thirty days, childbirth may be delayed by a week or two. Such a delay will not be considered as overdue. Two hundred and eighty days is only the average duration of pregnancy. However, every woman's body is different.

Calculate by ultrasound

There is another way to find out the date of birth. This can be done with an ultrasound scan (ultrasound) of the fetus. This method is the most accurate and reliable regarding the calculation of the date of birth using the previous two methods. If an ultrasound examination is performed at the very end of the first trimester, the date of birth can be determined with an error of no more than three days. During the second and third trimester of pregnancy, this method will not give such an accurate result.

After the first movement of the baby

1. From the day of ovulation;
2. From the first day of the last menstruation;
3. With the help of ultrasound examination of the fetus.

Now we will talk about another method. We determine the PDR by the first movement of the intrauterine child. Every expectant mother with such trepidation and impatience is waiting for the birth of her baby. Therefore, it is very important for a pregnant woman to try to accurately calculate the expected date of birth. How can I do this, do I know the date of the first stirring of the baby?

This means that after the first movement during the first pregnancy, approximately twenty weeks, or five obstetric months, remained before delivery. By marking these twenty weeks on the calendar, you will receive the estimated date of delivery. To determine the date of the long-awaited meeting with the baby in the second or subsequent pregnancies, twenty-two weeks must be added to the date of the first movement, because in this case gynecologists mark the first movement, usually at the eighteenth week.

However, you must understand that the calculation by this method gives an approximate due date. The error can be more than two weeks.

After obstetric examination

Before the twelfth obstetric week of pregnancy, each expectant mother needs to register with her local gynecologist at the antenatal clinic. Starting from the twentieth obstetric week of the “interesting position”, when visiting his gynecologist, the doctor measures the size of the abdomen, and also measures the height of the fundus of the uterus. These data are regularly entered into the exchange card. Based on these indicators in dynamics, the doctor can calculate the expected date of birth of your Miracle. Please note that this is an approximate time. You can calculate the due date more accurately using our due date calculator. This is a truly effective method with a minimum of deviations and errors in the calculations.

After examination by a gynecologist

A gynecologist during regular examinations of a pregnant woman evaluates the growth dynamics of the uterus. This organ increases in size along with the fetus. According to systematic examinations of the size of the uterus, an experienced and qualified gynecologist can predict the expected date of birth. In this method, it is very important to monitor the health of a pregnant woman in the first trimester of childbearing. Such a forecast will be effective when monitoring a pregnant woman in the early stages. According to the results of the examination in the second and third trimester, the prognosis of the PD will have a large error.

How accurate are the timing results?

The reality is that the duration of childbearing is individual for each woman.

1. Whether the first pregnancy;
2. What is the length of this woman's menstrual cycle;
3. Singleton or multiple pregnancy;
4. Genetics and much, much more.

If a woman gives birth not at the fortieth week, but at the thirty-eighth, this will also be considered the norm.

And even if mommy gives birth at the forty-second or forty-third week of pregnancy, this will also be the norm. Although many of the above methods for predicting the expected date of birth in their formula have the fact that the average pregnancy lasts two hundred and eighty days, that is, forty weeks.

The peculiarities of the course of pregnancy and the health characteristics of this particular expectant mother can lead to premature birth.

However, pregnant women who have calculated the expected date of birth, better organize the time of their "interesting position". Documents and a bag for the maternity hospital are ready in time. All examinations were completed on time. Ready and renovated children's room. Completed courses for young mothers. Completely ready for breastfeeding.

Therefore, this is a very useful thing for both mom and baby!

Are deviations from the deadline normal?

Are deviations from the calculated due date normal? Of course they are. Only seventeen percent of women give birth on predicted due date, while the remaining eighty-three percent give birth either earlier or later than due date.

The maximum accuracy in the calculation of the date of delivery is not to be expected. This is just a guideline. The lighthouse, on which the frigate of a happy pregnancy and joyful motherhood is heading. Not a single specialist, no matter how outstanding his qualifications, is able to take into account dozens of factors of a particular organism of a woman and an intrauterine baby.

Thus, in the normal course of pregnancy, childbirth occurs between the thirty-eighth and forty-second weeks. In this case, the birth of the baby will be normal (neither premature nor belated).

Remember that while carrying a baby, it is very important for a woman to maintain a positive psycho-emotional mood, to drive away unreasonable fears and worries. Our due date calculator will help you keep a positive attitude - very soon you will be a mother! Health to you and your baby!