U. S. Sen. Hillary Rodham Clinton, D-NY, and, former President Bill Clinton, blow out the candles on a cake at Hillary Rodham Clinton's 59th birthday party at Tavern on the Green in New York, Thursday, Oct. 26, 2006.
The unborn baby spends around 38 weeks in the uterus, but the average length of pregnancy, or gestation, is counted at 40 weeks. Pregnancy is counted from the first day of the womanâs last period, not the date of conception which generally occurs two weeks later.
Because not all pregnancies are equal in duration, it is impossible to predict the precise day on which your baby will be born. Pregnancies usually range from 37 weeks to 43 weeks, with most women giving birth between 39 weeks and 41 weeks after conception. Your due date is merely the middle of this fourteen-day window. There are several ways to calculate your due date.