Please help me. The first day of my last period was 29th august 2005. I had sex with my husband in the early hours of 11th september which is 13 days after. I am calculating ovulation as on the 12th september. Then on the 17th september which is 5 days after ovulation I cheated on my husband where a man's penis entered me once only and he did not ejaculate. I am pregnant, who is the likely father of the baby? I am worried about the chances of it being the other man. I am dueon the 5th june 2006.