I had my period 8-12-15 33 day cycle, i am now pregnant i had sex with a on 19-12-15 and then with b on 21-12-15 and 23-12-15 who would be the dad?

AnyOfThemBut21&23: It can be any of them.More likely 21/12 and 23/12 if your periods are pretty regular .But it is possible even on 19/12 Sperms usually may survive for 5 days and under the best conditions up to 7 days.And it also depends on the time you ovulate around mid periods that is 14-15 days after the period in women who have regular periods 28to30 days.But not always and not in every women,Anything possible