it's generally 2 weeks after the first day of your most recent period. so if your period started october first, you are considered pregnant october 14th, and they will start counting from that day. even though you may have conceived any time before or after that date. its weird i know. due dates are only an estimate anyway, ultrasounds, conception and period dates only help get a more rounded conclusion. with my 2nd pregnancy, i knew i conceived february 22nd and my due date wasn't til december 6th. which meant i got pregnant in march, 3 weeks after my husband deployed. try explaining that one to him. well they baby came a week after that due date on the 12th, and weighed 10 pounds. i had no GD or anything and my first was only 6, that's how i know they were wrong on my due date by a whole 3 weeks, it should've been november 15th!
at 11:27 AM on Nov. 18, 2010