Most likely you're going to have to get a DNA test. However, getting a tarot reading with a reputable reader might help provide guidance about who the father could be. We recommend our favorite tarot reader, John.
Going with simple math, two weeks after the first day of your last period is around the time when you ovulated. So the conception could have happened three days before or after ovulation. If you were banging both men in that week, pray it's not twins!