Please help! I have a problem. Okay so Ive always had regular periods, and when i missed my period at the end of May 2012, I knew something was up. A few days later I had spotting. I was with partner #1 until June 28th 2012. I slept with partner #2 about the second week of July 2012. I did not go and get an ultra sound and find out for sure if I was pregnant until about 2nd or 3rd week of July, after sleeping with Guy #2 in. When I went for the ultrasound though, nothing had showed up and I was a little concerned. I know I put it off for long but I only had my 2nd ultra sound until November 14th 2012. The doctor said I was About 24 weeks and 3 days along and I had conceived in the beginning of June which would mean It is partner #1's. But what confused me is the due date of March 18th 2013. PLEASE HELP !!!!