Yes hello I'm stressing my situation in 25 weeks pg and I had been with two men my last period was the Feb 18,15 thats what doctors used also due date is 11/24/15 and they told me I conceived between the 3-7 of march and I was with my bf that weekend but we had broken up before and was with someone on that Sunday the 1st before that now I was with my bf all that weekend and was very sexually active in nervous that might not be his now the man from the 1st didn't even get to finish