hi everyone. i hope i could get an answer with my concern. i was born with an irregular period. i dont really track my menstrual period because i get used to not having period for a month or two. the last time i remembered, i had my period last week of november. i had sex with this guy on dec 17. we had sex (unprotected) on the beach (we were submerged in water and it was quick). but were not together. i have a boyfriend and we started jan 21. we also had sex (unprotected) on the same day. now im pregnant. we had an ultrasound on may 8 and the doctor said im 16 weeks and 5 days pregnant. and my due date is early october. who could be the father of my child?