Gestation begins at conception. The gestation period is 38 weeks or 8.85 months. Call your OB/gyn and ask the doc directly: How many weeks from conception to birth?
Or heck, just check any encyclopedia.
Your the idiot! I know damn well actual pregnancy starts at conception, but OBGYN's count pregnancy from the 1st day of the last period before conception, making it a 40 week pregnancy.
I've had two boys, and two miscarriages and know exactly how OBGYN's determine weeks of pregnancy and it is never by gestation!