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.
This is how doctors determine your due date to give you an idea of when you can expect your baby to arrive. Most pregnancies last anywhere from 37 to 42 weeks with 40 weeks being the standard length of pregnancy. Once you hit the 37 week mark your baby is considered full term and safe for delivery at any time.