So the first time her and I had sex was either the 29th or 30th of sept. Her due date is June 26th, and the weekend before she had sex with her ex. I don't know if it is mine or not. I look at all these calculators and all that, and all it asks me is the first day of her last period.. I don't know that, and I am completley stressing out. Yes I should have been more careful, but I just want to know if it is mine. When I put in the due date to certain calculators, it says that she has been pregnant for 93 days, and we had sex the first time 82 days ago.. I just don't know. Any help??