It is normal for pregnant women to get anxious about seeing the baby in the last days of pregnancy. Most of them have a common question – How many weeks is my pregnancy? It is never a easy question to answer. It is difficult to understand exactly when you have become pregnant. That is why gynecologists always consider the last menstrual period to calculate your pregnancy.
The first day of your last menstrual period is considered to be your first day of pregnancy.. The egg may survive anywhere from 12 to 48 hours. The sperms on the other hand survive for 3-6 days. So the fertile period extends from days 10 to 18 in a 28 days menstrual cycle.While pregnancy is considered to last 40 weeks (280 days) from the first day of the last menstrual cycle, term pregnancy which was earlier considered to extend from 3 weeks earlier (37 weeks) to 42 weeks is now classified as ‘early,’ ‘full,’ ‘late,’ and ‘post-term’ to reflect subtle differences in outcome of pregnancies.