I am 28, 150 pounds, and have a history of irregular periods. As of now I am 21 weeks pregnant and due October 30, 2011. My situation is, I'm worried that my ex could be the father of my child and not the person that I am currently with. Me and my ex didn't have sex around the time that I think i got pregnant, even though there was some sexual contact between the two of us (he didn't ejaculate). Me and my current boyfriend did have sex quite regularly around the time that I think i got pregnant. Who is most likely to be the father?