I had sex with Father A at the beginning of June, I had sex with Father B after the 18th of June. I was due February 29th, but actually had the baby March 4th. Having the the baby in February, it seemed more likely that Father A would be the father, but the fact that I had the baby late, could father B be the father? I think my doctor based my due date on the first day of my last period, which was May 24th, but I am also extremely irregular. Please help!!!!!!