Lost my my Virginity at 16 and took the 72 hours after pills

OK.....August 16 i went to a party with my friends (but that same day got my period )at the party i saw my ex-boyfriend while in the party i started to drink a lot and end up having sex with my ex-boyfriend but we did use protected. now one of my questions is if i lost my virginity because during the sex i had my period and when he got on top of me and started to push he hurt me and i told him to stop but he would just stop for a while and being to do it again but after a while during it i didn't feel anything (that good feeling that everybody talks about nothing it just hurt a couple of times) after that as soon as i got home i took a bath because i felt so dirty that night i didn't sleep i felt so bad like if nothing matter anymore i wanted to died i even was thinking of killing my self :-( (that's my second question why do i feel dirty and so bad about it ? ) that next day my friends saw how i looked but i didn't what to tell them what was going on because i was stupid to have sex at 16 on August 18 i told one my friend why i was so sad and she told me about what if a i was pregnant and then she told me a bit about after sex pills so the next day she took me to the doctor and (i still had my period)i told him what was going on and he said that he was going to give me the 72 hours pills and he told me that i was going to bleed again in 7 days. and so the 6th day got here and the boy that i like being to talk to me and i felt for it and he told me that he would be my boyfriend if i had sex with him and my stupid self got brainwashed because every girl wants to date him anyways while kissing him he was going to started with the sex and so i let him but i couldn't and he got mad and he told me to go down on him and i couldn't and that A-hole did himself a job and because i didn't help him he put his sperm in my face and down my t-shirt what an A-hole
the next day 7th day i had blood in my underwear but it was kinda brown now i don't know if it is the pill or the sex ???? please help me
today is almost the end of December and i been having my period since August but i don't know if i am late because my period always came different days since i was 12 ?? please answer me i really worry ??? :-(