I Really Just Need to Know ! Who is the father ?

Ok , in march on the fri. Of the 17 or the fri. Of the 24 I had sex w/ one man (its one of those fri.S im sure) and stupidly it was unportected. Then in april I had sex w/ a different one on the 14 which was a fri. Well I found out I was pregnant and went in for a ultra sound june 8 and it said I was 9 weeks 6 days, my doc said my edd will be jan. 6. And that my conception was on april 16. And in august they changed imy due date to jan. 8 which is not a big difference but, my question is what is the day of intercourse that will result in or around my conception? And how long dose sprem survive in the cervix? Please thank you and no I dont know when my lmp was so...