So me and my girl had sex on 7/2 and she was suppose to have her period on 7/7 and now she is 3days late is there a chance she can be pregnant?

Hard to say: Pregnancy has been documented from exposure on any day of a woman's cycle, including during menses. That said, it would be more likely if there were additional exposures mid cycle. A urine pregnancy test would seldom be positive less than two weeks into a pregnancy, so testing now might reflect an earlier conception but not one 5 days ago.Learn to cover up or you'll eventually be a dad.