I am 29 weeks pregnant, my due date is October 10, 2010. My last menstral period was Jan 6-Jan 10. I went to the doctor on Feb. 22, and she said I was 7 weeks pregnant. I had been with my boyfriend for three years, and had sex very frequently. We had sex Jan 1, 3, 8, 9, 10, 11, 12, 13th. (I was on my period a couple times we had sex.) We broke up, and I had sex with someone else around Jan. 20th. I asked my doctor if she was sure about the 7 weeks, and she said yes, even though my period was not over until the 10th. I went to the doctor for an ultra sound around 21 weeks and the baby weighed about 1.3 lbs, and my due date has not changed. I just want some assurance, or some opinions on who the father would be. I know it is close to time, but I really believe and according to the doctor my first partner would be the father. I do not think that doctors could be that far off, because I thought it took about 10-14 days after sex to become pregnant, which if I went to the doctor feb. 22, and the doctor said I'm 7 weeks, there isn't a way it could be the second partners. Right? I'm just afraid. Any help would be appreciated.