i was suppose to have my period on the 25th last month and ive been having the bloating and pms symptoms like i would if i were gonna start but on that i day i had sex w my and half way thru i noticed i was bleeding alot so i figured i got my period. But there was no blood after that until the next time we had sex the next day and then again no blood after that. only when i urinated notice pink on the tissue thats all. lasted 2 days and havent bleed since. what is this???