Every pregnant woman should and wants to know when to wait for her replenishment in the family. To do this, you will have to understand how the date of birth is calculated. The thing is that this is far from the most difficult process. Moreover, the girl can cope with the setting of the estimated date of birth independently. It is simple enough to understand how experts determine the DA. Everything is much easier than it might seem at first glance. True, the data obtained cannot be called 100% reliable - the female body can present a “present” in the form of later / earlier births under the influence of external factors, as well as due to incorrect calculations.
About becoming pregnant
How to calculate the exact date of birth? Unfortunately, childbirth is a process that is difficult to control. Professionals can calculate the DA, but nothing more. The estimated date of birth is a kind of guideline, but not a guarantee that the girl will give birth on that day.
First you need to understand how conception occurs. This process is carried out during the fertilization of the egg. First, the follicle matures in the girl’s body (starting from the first day of the menstrual cycle), then ovulation occurs. It is at this moment that the chances of pregnancy will be above all. If during the ovulation or 3-4 days after it the egg collides with sperm and they fertilize it, we can talk about a successful conception.
A fertilized egg reaches the uterine cavity, and a fetal egg is formed in it. It attaches to the uterus, after which we can talk about the pregnancy. But how to calculate the day of conception by the date of birth? And to determine the DA?
Ways to determine the term "interesting position"
How is the date of birth calculated? In modern medicine, there are various ways to solve the problem. Next, we will try to consider them in detail.
Among the existing methods for determining the date of birth use:
- monthly method;
- according to a special calendar;
- using ultrasound;
- using tracking movements;
- by date of ovulation;
- using digital pregnancy tests.
It is recommended that all these techniques be used together. Then the girl and the specialist doctor will be able to get the most reliable information.
About the duration of pregnancy
Thinking about how you can calculate the estimated date of birth, every woman should understand how long the "interesting situation" lasts. The DA depends on this.
Normal pregnancy lasts 9 months - 40 weeks. It is for this period of time that it is customary to set the DA. Nevertheless, childbirth can begin at any time, most often from the 37th to the 42nd week of an "interesting situation". Therefore, the DA is a kind of guideline.
Important: under the influence of external factors or heredity, a woman can give birth even at the 25th week. This is a pathology, but it still occurs. Predicting it is almost impossible.
For menstruation
How to calculate the date of birth for the last monthly? This is the easiest solution for those who want to understand when labor is expected to begin. You can cope with this task at home. It is enough to carry out the simplest mathematical calculations.
With a delay of menstruation, the girl should do a pregnancy test or donate blood for analysis (concentration of hCG). If the pregnancy is confirmed, it is worth remembering when the girl had her last menstruation. How is the date of birth for menstruation calculated? For this, the Negle formula is used.
From the first day of the last menstruation, 90 days are taken, and then a week is added. This is the estimated date of birth. Everything is quite easy, but such a solution is not the only one.
Important: determining the gestational age for the last menstruation is the obstetric term for an “interesting position”.
By ovulation
How to calculate the date of delivery by monthly, found out. Only this is far from the only scenario. You can cope with setting the estimated date of birth by ovulation. This technique is not too common, but it allows you to understand the real term of the "interesting situation".
If the girl knows when she ovulated, and also take into account the duration of the menstrual cycle. Normally, the latter is about 26-30 days. In this case, ovulation occurs on the 14-15th day of a new cycle.
After it was possible to calculate the date of ovulation, you just need to add 280 days to the resulting number. The output will be able to see the estimated day of birth.
By date of conception
But this is far from all. Some try to calculate the date of birth by the date of conception. Can this be done? Yes, but this is the least accurate method. It is connected with the fact that understanding when the conception occurred is problematic. Especially with active sex life.
Suppose the moment is known. Then, in order to calculate the date of birth by the date of conception, 38 weeks must be added to the information received. This is the DA.
Important: in order to understand when conception occurred, it is recommended to keep a basal temperature chart for several months of pregnancy planning.
Tests to help
How is the date of birth calculated? Modern technologies are actively developing, opening up new opportunities for people. And in the field of definition of "interesting situation", as well as its term and DA, too.
For example, to achieve this goal, some use digital pregnancy tests. Some such devices show not only the presence of an "interesting position", but also its duration. It is very comfortable.
To achieve the desired result, the girl is recommended to do a digital pregnancy test, and then see how long he issued on the day of the study. You need to take it away from today (those when the test was done), and then add 40 weeks.
Important: this technique is not always accurate.
Ultrasound to help
It is already possible to calculate the estimated date of birth, in various ways. True, all the proposed methods are not 100% reliable. The body can give a "surprise" at the most unexpected moment.
The most accurate way to determine the gestational age, as well as PDD is to conduct an ultrasound examination of the pelvic organs. A specialist doctor will be able to assess the condition of the fetus, and then report the estimated day of birth.
It is easy to guess that you will not be able to use such a technique on your own - you must always consult a specialist doctor in a clinic or a private medical center. But just such a solution is the most accurate and reliable.
First stir
Not all girls know about the next method of solving the problem. The thing is that you can understand when to wait for childbirth by the first baby movements. This technique is very rare in practice.
How to calculate the date of birth on the first stir? Scientists note that the first movements of the baby mom, waiting for the firstborn, feel at the 20th week of "an interesting position." Girls who for the second or more times become mothers - on the 18th.
Accordingly, it will be necessary to add 20 or 22 weeks to this or that date. True, this technique often gives strong errors. Some girls feel the movements in the 17th and 15th weeks of the "interesting position". It is because of such inaccuracies that this technique is refused. However, if there is no other way to calculate the date of birth, you can use it.
Special calendar
How is the date of birth calculated? It's hard to believe, but now almost all gynecologists have special gynecological calendars. They are made in the shape of a circle.
During the reception by the gynecologist for pregnancy, the specialist, as a rule, asks to inform the woman the date of the last menstruation. In addition, he studies the data on a blood test (if any), and also conducts an examination on the armchair.
Based on the data obtained, the gynecologist gives the impression of the estimated date of conception. All that remains now is to use the calendar. The gynecologist sets a mark near the date of the last menstruation, and then in the designated window sees PDR. Very comfortably!
Important: this technique is usually based on the use of the Wenge formula.
Online mode
How to calculate the date of birth by ultrasound and not only, we found out. It is advisable not to make calculations on your own. To do this, it is better to attract specialist doctors. Pregnancy itself is unpredictable, so there is a high likelihood of an incorrect determination of DA. In addition, modern technology helps to notice the pathology of pregnancy. And this, in turn, suggests the likelihood of premature birth.
How is the date of birth calculated? The answer to this question will no longer put a woman in an awkward position. However, all the tips listed above are not exhaustive. Some girls rely on special online calculators. They, as a rule, allow you to carry out calculations by the date of the last monthly.
To calculate the estimated date of birth in this way, you need:
- Go to the site with an online maternity calculator. Such services can usually be found in various women's forums.
- Indicate the date of the last menstruation. Usually refers to the first day of the last menstruation.
- Set the duration of the menstrual cycle.
- Click on the button responsible for the start of calculations.
In a few seconds, the girl will see the PDR on the screen. Fast, easy and very convenient! And most importantly - reliably and for free. True, it is not recommended to rely completely on such a technique, like most of the ones listed above.
Possible difficulties
How to calculate the date of delivery by menstruation is now clear. But what difficulties can some women face?
Firstly, with premature birth. Fortunately, they can often be assumed if you carefully monitor the development of the fetus.
Secondly, girls with irregular periods will not be able to independently calculate the PDD by the proposed methods. In them, as a rule, DA is determined with the help of specialist doctors, but they can be mistaken for several weeks.
Thirdly, it is not always possible to accurately determine the exact date of conception of the baby. This creates some difficulties in setting up the DA on their own.
No sexual intercourse - there is a pregnancy
Calculating the date of birth by the date of conception is not as difficult as it seems. And put the DA in the form of an approximate guideline for childbirth, too. Some girls experience unplanned pregnancies. For example, in the absence of sexual intercourse on the day of ovulation. Can this really happen?
Yes. The thing is that male sperm can live in the body of a woman in anticipation of an egg ready for fertilization up to 7-8 weeks. Unprotected intercourse, which took place a week before ovulation and 3-4 days after it, can really lead to pregnancy. This must be taken into account when contacting a gynecologist.
However, according to the date of sexual intercourse, PDRs are not calculated. But with the help of this, it is sometimes possible to guess the day of conception of the baby. And already use this information in the future.
Conclusion
Now it’s clear how the date of birth is calculated. Modern girls can cope with a similar task in various ways. Most of them are easily mastered at home.
Despite the variety of methods proposed, it is better to entrust the setting of the date of birth to specialist doctors. They will be able to cope not only with this task, but also see how well the fetus develops. Moreover, doctors help calculate both the actual gestational age and the obstetric one. These periods differ by approximately 2 weeks. This is due to the fact that the first is put on the date of conception, and the second - on the first day of the last menstruation. Everything is extremely simple and clear.
In any case, calculating the estimated date of birth in modern realities is not so difficult. Each woman can independently choose the method of calculation, which seems to her the most simple and accurate.