Im a little worried. My last period was july 28,2016 which lasted 5 days. I just found out i am pregnant . I had sex on august 8th and he had busted inside for sure. Then i had sex on August 12 and he had never busted in or out, the sex was really quick & stopped. Im a little worried did i get pregnant on the 8th with sperm or on the 12th accidentally . Is there more of a percent from one man than the other ?