I ended up 8 weeks & 5 days preggo on March 10th . I had sex with someone on Jan 15 . Being as though my possible conception date is Jan 23rd due to that ultrasound on March 10th , is it possible that I'm pregnant by that sexual encounter  ( he used the pull out method by the way ) vs .  unprotected sex with my boyfriend & letting him ejaculate inside of me almost everyday after that ?