Let's consider, what are the methods of determining the duration of pregnancy in our time.
Determination of the gestation period by the calculation method on the day of conception and the date of the last menstruation
Everyone knows that the day of conception of the baby coincides with the day of ovulation of the menstrual cycle. Therefore, to determine the expected duration of pregnancy, you can use this calculation: from the first day of the last menstrual period, we count 14 days and get the expected date of ovulation. It is 32-35 days, the expected date of ovulation is 17-18 days from the first day of the last menstruation. This calculation is suitable for women whose menstrual cycle lasts 28 days. In addition, for the calculation of ovulation, you can use special home tests for ovulation or to measure basal temperature.
It is important to take into account that the definition of the period of pregnancy on the day of sexual intercourse is considered erroneous, since spermatozoa trapped in the uterus and fallopian tubes are able to live up to 7 days, waiting for the release of the oocyte from the follicle. Therefore, it is better to determine by the day of ovulation, after all, the egg after exiting from the ovary exists only for a day. Thus, in order to become pregnant, it is necessary to plan conception several days before ovulation, than to be late even for one day.
Determination of the term of pregnancy by ultrasound diagnosis
One of the most reliable methods of determining pregnancy is the method of ultrasound diagnosis. Already from the first weeks of pregnancy, according to ultrasound, you can calculate the size of the fetal egg by the average diameter and determine the duration of pregnancy. The optimal for determining the duration of pregnancy is the examination of ultrasound before the 24th week of pregnancy.
Determining the duration of pregnancy by examining an obstetrician-gynecologist
The most objective definition of a pregnancy in the first trimester is a woman's examination from an obstetrician-gynecologist, during which the doctor manually determines the size of the uterus. The matter is that at approach of pregnancy, the uterus increases and becomes round. Therefore, starting from the 5th week of pregnancy, the doctor authentically determines the duration of pregnancy by the size of the uterus.
Determining pregnancy by the first movement of the fetus
Often, many women determine the presence of pregnancy only in later periods, feeling not inherent in the earlier wiggling of the fetus. Movement of the child can be felt from 18-20 weeks of pregnancy, sometimes from 16 weeks. This method of determining pregnancy of course, can not be attributed to accurate, but many pregnant women find out about their interesting situation in this way.
Based on the above, we came to the conclusion that the most optimal method for determining the duration of pregnancy is an examination of an obstetrician-gynecologist or ultrasound diagnosis. Therefore, in order to be confident and not torment yourself with doubts, at the first suspicion of pregnancy, consult a doctor. I wish you success!