Im sleeping with two guys(unprotected) One guy i only slept with around middle of dec. Other time(same guy) was on jan. 2..And the number two guy was all the days in between those days. The first day of my last period was dec. 8. At which gives me sept 13 as a due date. But when i went for ultrasound doctor said Im at 8weekscouple days..and baby due sept 26. so, can you tell me which guy is the father????