Expert: Catherine Beier MS CBE - 10/4/2009

Question
This is hard. Im going to try my best to put it into words. The first day of my last period was Feb. 1, 2009. My boyfriend and I were together clear up until the last week of Feb. when we split (for just a week). I ended up hooking up w/ my ex-fiance the nite of Feb. 25th (It was Ash Wednesday). The next week, the boyfriend and I got back together. Bam, Missed my period. Ended up in the hospital and had a transvaginal ultrasound done. On the date of March 23rd, the doctor told me I was 6 weeks and 2 days pregnant. Which puts me getting pregnant before I hooked up with my ex-fiance. right? So here's where it gets tricky. At first my OB told me my due date was Nov. 7th. Then he told me he never told me it was the 7th that its Nov. 15th. Could I have all gotten pregnant on Feb 25th? I mean that ultrasound that early in my pregnancy said I was 6 weeks and 2 days along. And I heard that its very accurate when ur that early in pregnancy. I hope I didnt confuse you. :(    Im due soon and really need answeres. Thanx so much.

Answer
Casey,


Don't worry, you didn't confuse me at all.  Based on your ultrasound on March 23rd, your due date would be November 15th. This means you most likely conceived around Feb. 21st, before the date of intercourse with your ex.



However, while early transvaginal ultrasound is very accurate, usually within +/- 3 days, this margin of error is very close to the time you were with your ex.



So, while my money is on your boyfriend being the father, you'll need a paternity test to know for certain.




Best,
Catherine