I had sex on 10.15.13, 2nd day of period & he pulled out. i got back w/ bf after & been active w/ him only. due date is 7.21.14. who's the father?

Dates: It looks like you've got a due date that might be based on your lmp. Do you have a due date from your first ultrasound? Is it any different from this date? If your first trimester ultrasound confirmed this due date, then your conception date was likely within 1 week of october 28th. If you do not have an ultrasound to confirm this date, then there's no telling for sure when conception occurred.