Is there a difference between obstetric and real pregnancy? We will analyze this question in the article.
The content of the article
The moment of conception of a new life, as a rule, is coming unnoticed for a woman - because it is not for nothing that it is called the sacrament. Therefore, when the future motley learns about his pregnancy, it counts its approximate period depending on the intensity of their sex life. But the doctors consider him a little differently, taking into account the deadlines for the last menstruation, so he often turns out to be longer.
What is the difference between obstetric pregnancy and women's calculations?
Gynecologists calculate the term of pregnancy through a simple mathematical formula, which takes into account the average duration of the menstrual cycle (28 days) and the perfect moment of conception (2 weeks after the first day of menstruation).
- Women calculate the period on the basis of their physiological features and the rhythm of sexual life. In addition, now there are so accurate tests to determine pregnancy, which indicate even its exact duration, practically without deviations. We are talking about reusable tests - with electronic sensors and a small monitor on the front panel, the accuracy of the response to 99 percent and the determination of the period of pregnancy.
- If the sex acts in a woman had a little and with a large temporary interval, then the task is generally greatly simplified - you only need to calculate the days.
date
As a result, the embryonic and obstetric dates usually do not strongly coincide and permiss the error to up to three weeks, because the ideal moment of conception does not always coincide with the fact that nature has conceived.
How to calculate the date of childbirth for timing?
In women, the peak of ovulation may come in different days of the cycle (and not at all on the 14th day) - this can also be checked with the help of special tests (but, of course, before the occurrence of pregnancy).
If, for example, the cycle time is 24 days, fertilization can occur on 9-10 day from the beginning of the month, and if the cycle time is 35 days, then the peak of ovulation account for 21 days. As you can see, quite a serious mismatch, so the maternity period is very often very far from reality.
We expect life
At later stages of fetal development to establish its age with a greater degree of accuracy will help ultrasound.
What will help to ascertain the duration of pregnancy?
To determine the duration of pregnancy, especially in the beginning, to help future mums comes hormone hCG - human chorionic gonadotropin. Just a week after fertilization, this hormone starts to be developed intensively in the woman's body and provides the appearance of estrogen and progesterone.
Set a time limit by the test
- Initially, hCG is produced very much, and his number is doubled every two days, and then to 9-11 weeks of pregnancy, it becomes more and more (although the rate of release of slightly slowing down). After such peak, a gradual decrease in the level of this hormone.
- Scientists have developed a special schedule, according to which the embryo age you can find out the number of hCG in the body moms. For example, during the first two weeks hormonal level ranges 25-156 mU / ml, The third - 101-4870 mU / ml, The fourth - 1110-31500 IU / ml etc.
- It is best detected the hormone levels in the analysis of the blood of women, because the test strips are not always of sufficiently high quality or else during storage was flawed.
- In addition, ultrasound also gives very accurate results when determining the age of fetal development, as the calculation is based on the size of parts of the body of the embryo.
Whatever it was established by physicians date of birth - this is not the ultimate truth. Usually the kid himself knows when it's time to be born, if development proceeds without deviation.