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ok..im so confused, im 25weeks pregnant right now, and i had been with my boyfriend for 4 years but we had broke up in aug. 2006 for a while, and i had s_x with another guy just a one time thing on sept. 15 ..well me and my boyfriend got back together the end of sept. and my last period was sept. 20th and the only person i have been with after my last period was my boyfriend, i calculated and i think i would have gotten pregnant oct. 4th but im not for sure and im just wondering if there is a chance that my baby could be the other guys instood of my boyfriends even tho i had a period (and it was a normal pretty heavy period lasting 5days)?? Ive had an ultra sound and the doctor said the babies measurements matched up with my LMP pretty close. I havent been on birth control since june 06 and every since i went off it my periods have been sorta irregular, i do know my period before my last one was aug. 28, so my cycle had been about 24days. I know that i havent been with anyone else but my boyfriend after my last period and i know that we had s_x on oct. 4th but i heard that u could be pregnant and still have a period. Thats why im wondering if it could be the other guys instood of my boyfriends?? Can u tell me when i conceived? the doctors gave me a due date of june 27 2007. [ and im not a cheater, i was only with the other guy b/c i thought me and my boyfriend were broke up for good b/c he was seeing other girls, but we ended up realizing we really love eacthother and got back together, i have always be faithful and havent been with anyone but him since we got back together!!]