Medical Advice On Virginity

I had sex with my girl who claims to be a virgin,it was indeed complicated because that very first day it was had to penetret but the secon day i forced myself into her at the end there was a little flow of blood at that point but what is confusing me now is dat late in the evening that same day she started having Her monthly discharge so please doctor am confused i need you to help me explain my chance of being the one who disvirgined her,thanks.