I was with someone for a little while but the relationship failed and i moved on and found another man in like 2 weeks. By the end of that relathionship i found out i was pregnant. I believed that it was my second boyfriends baby but he looks like my first boyfriend, but if it is my first boyfrieds baby then my utrasound was like 6 weeks off and the doctor believed that i was further along than what my ultrasound was saying before i had the baby, is it possible for an ultrasound to be that far off.