This may take a second to lay out, but here goes. My Ex-Girlfriend is pregnant and I'm worried that it's mine and that she's lying about it. She is back with her ex-husband and says it is his which is what I want to believe, but... When we were together, she had a period that started on the 14th or 15th of November. We had sex twice between November 27 and the first week of December (right in her ovulation period if I'm correct). Right before we broke up, her period in December came late, around the 20th and she said it was pretty short with not much flow. She got back together with her ex-husband then and she found out she was pregnant on Jan. 21st. I figured I was fine because I assumed that they concieved in early January, but she said that was not the case, it was from Christmas Eve or Christmas (not in her ovulation period). Not 100% sure if they had sex after that or not. They offically got back together when she found out that she was pregnant. She had originally posted on a blog the night she took the home test that the due date would be August 20th, but then switched it to Sept.26th. She had her doctors appointment on Jan 28th and she said the doctor said she was 5 weeks pregnant, but do they do any tests at that point or do they just base that on when she said the first day of her last period is? We no longer talk, she doesn't want him to find out that we were together, and we work for the same company which would provide a big problem. I want nothing to do with her, but at the same time, I'm a responsible human being and I'm not gonna go through life having a child in the world that I'm not involved with. So based on the information I have given, what are the chances that I am actually the father? I appreciate any clues you can offer because I'm really lost on what to do and I can't get any information out of her. Thanks!