Pregnancy for ten months shows that the whole pregnancy stage of the mother is particularly great. After pregnancy, it will go through a long stage, but the month referred to in medicine and our daily month are not the same calculation method. The pregnancy period is generally 40 weeks, totaling 280 days, calculated from the last menstrual period, and each pregnancy month is 28 days with four weeks. After pregnancy, it is necessary to understand the calculation of weeks to facilitate pregnant women to understand their expected date of delivery. How many weeks is the pregnancy period generally? The pregnancy period is generally 40 weeks, and delivery within 38-42 weeks is full-term. Because it is difficult for every pregnant woman to accurately judge the time of conception, so medically, the expected date of delivery is calculated from the first day of the last menstrual period, and the entire pregnancy period is 280 days, 10 pregnancy months (each pregnancy month is 28 days). Because the menstrual cycle of each woman is different, it is normal for the estimated expected date of delivery to be 1-2 weeks different from the actual expected date of delivery. How to calculate the pregnancy time? The beginning of pregnancy can be determined in several ways. One is to detect the hormones produced by the newly formed placenta. Clinical urine and blood tests can detect pregnancy within 6-8 days after conception. Home urine tests are usually effective 12-15 days later, but both of these methods can only detect pregnancy and cannot determine the date of conception. Pregnancy can also be determined by the interruption of menstruation, which occurs earlier than any early symptoms of pregnancy. In fact, doctors usually calculate the date of conception (i.e., the "age" of the embryo) based on the first day of the woman's last reported menstrual period. Since the date of conception is difficult to determine, embryos and fetuses are only scientifically distinguished and not distinguished in actual pregnancy.