Hi, my boy friend and i have been together for three years. Just recently we had sex for the first time p.s. he took my virginity. Anyways, i noticed he had precum while i was giving him oral sex which obviously i got off while performing oral sex. we didnt use protection. Before he put it in he checked for precum and he didnt ejaculate AT ALL. My period didnt come and its currently two days late. We had sex three weeks ago. i took a pregnancy test and it came back negative. Still no period. Whats going on??