What you need to know in order to calculate the duration of pregnancy
Any woman who expects a child is vividly interested in the question of howto calculate the duration of pregnancy, because it is necessaryknow to determine the long-awaited day of the appearance of crumbs to light. Unfortunately, no one can determine the exact date of birth, usually they speak about the expected date. Another point is puzzling in women for the first time pregnant women - the difference between the period that determines themselves and the term of pregnancy, which will put the gynecologist after the examination. This is explained quite simply.
Even if a woman knows exactly when there was a sexual act, and she had the opportunity to become pregnant, in her attempts to calculate the gestational agecan sneak in error. After all, the fertilization of the egg and the onset of pregnancy can occur only after ovulation - there must be something that can be fertilized. Spermatozoa creatures are very tenacious and can be in combat state for several days already in the female body. Therefore, to say exactly when the conception itself was quite difficult.
Determine the day of ovulation and soto establish the date of conception is also quite problematic, especially for women who do not have a regular cycle or if they do not follow their cycle at all. This is also often enough: young and not very women do not keep a calendar of menstruation.
To calculate the duration of pregnancy,Know the exact number when you started the last menstruation. Two hundred and eighty days are added to it and the date of birth is received. Where do the two hundred and eighty days come from? These are ten obstetric months for twenty-eight days - this is the number of days that pregnancy should last. Accordingly, it is easy to calculate which week of pregnancyat this moment.
This is how the term of obstetrician-gynecologists counts, and you will be asked this when you come to register or you go to the gynecologist for any reason.
Another way to find out when should happenchildbirth: it is necessary to take three months from the date of the last menstruation and add seven days. Let's say the monthly was last August 21 minus three months on May 21 plus seven is obtained on May 28. This is an approximate date.
By the way, many gynecologists use special calendars that help to calculate the exact duration of pregnancy, their principle is based on the date when the last menstruation began.
When conducting an examination of a pregnant woman, an experiencedThe gynecologist can calculate the gestational age, given the change in the size of the uterus. And the accuracy of this method is high if you come to register before the twelfth week. Another method to establish a period is to carry out ultrasound at the same time, because it is based on measuring the size of the fetal egg.
Why exactly up to twelve weeks? Because in the future the embryo is developing and different children get different children. That is, the size of the child can be significantly different, because babies are born, and 2,900 grams and 4,300 grams each.
In the future, to determine the duration of pregnancy accuratelyit is quite difficult, the risk of error increases because of the differences in the constitution of mothers and, accordingly, in the development of children. But under supervision the gynecologist carries out various measurements that allow you to orientate in the term of pregnancy. In this case, the following shall be taken into account:
- volume of abdomen;
- height of the bottom of the uterus;
- size of the uterus;
- length of the fetus and size of the head.
In any case, it should be remembered that the termwhen he is born, the baby himself determines, whatever forecasts mom and doctors make. A normal term is a child who appears from the thirty-eighth to the forty-second week. If you are expecting not one, but two or more toddlers, then the birth can happen a week earlier.