How to determine the exact time of pregnancy? The normal pregnancy time is limited to about 40 weeks. In medicine, the first day of the last menstruation is often used to calculate the expected date of delivery. The normal pregnancy period is about 265 days (referring to the day when the egg is fertilized), and ovulation occurs in the middle of menstruation. Therefore, 40 weeks (280 days) of pregnancy is two weeks longer than the actual pregnancy time when the egg is fertilized.
If the expectant mother takes 28 days as a menstrual cycle, then 280 days of pregnancy is equivalent to 10 months of pregnancy (28 days is a menstrual cycle) or 10 menstrual cycles, so there is a saying that pregnant in October.
From the first day of the last menstruation: the month of the expected date of delivery is the month of the current month. If it is greater than 3, subtract 3; if it is less than 3, add 9 to be the month of birth. Date: If the date of the last menstrual period is 14 days according to the lunar calendar, it is the date of birth, and the Gregorian calendar is 7 days. If you can't remember the date of your last menstruation, you can calculate it according to the date of fetal movement. Generally, fetal movement begins after pregnancy 18-20 weeks.
The calculation method of pregnancy is: the primipara is fetal movement day plus 20 weeks, and the multipara is fetal movement day plus 22 weeks. In addition, the last day of the low temperature section of the basal body temperature curve is regarded as the ovulation day, and 264-268 days or 38 weeks are counted backwards from the ovulation day. The expected date of delivery is only an estimated date, not to say that anyone born is normal, one week later or one week earlier.
What are the symptoms at the beginning of pregnancy? 1. Menstrual cessation: This is the most common sign of pregnancy. As long as women of childbearing age have normal menstruation and have normal menstruation for more than two weeks after sex, it is possible to get pregnant. However, it is not menstruation or pregnancy. There are many reasons why menstruation doesn't come, which may be poor ovarian function, abnormal hormone secretion, busy work and nervous exams. These will all cause the phenomenon of late menstruation. So it's best to be diagnosed by a doctor, which is the safest.
2, often feel sick and vomiting: almost many pregnant women in the early pregnancy often feel sick and vomiting, especially at the beginning of the day. These symptoms vary from person to person. Some people's symptoms are quite mild, while others are very serious. Unless you are seriously ill, vomiting and need to see a doctor, these are normal phenomena in the early pregnancy.
3, breast tingling, swelling, itching: breast tingling, swelling, itching, which is a physiological phenomenon in the early pregnancy, in addition, there will be changes such as dark areola color, obvious lines under the breast, and obvious nipple protrusion.
Easy to get tired: easy to get tired in the early pregnancy and often want to sleep.
The whole pregnancy lasts about 40 weeks. During this long day, pregnant women should make proper arrangements in clothing, food, shelter, transportation, labor, rest and so on, in addition to regular prenatal examinations, so as to ensure their health and the normal development of the fetus.