bleeding after sex ?

hi ladies! so i got off my period friday night and stayed the night with my boyfriend last night. this morning we had some pretty intense sex . nothing different than what we normally do, only he came in me (never had that happen before ever.) i am on the pill so i didn’t really worry about it beens it’s just a one time thing , we have unprotected sex a lot but that’s the first time he has ever came inside me so i have no idea if that has anything to do with it , but anyways i put on a panty liner so i didn’t get it all over my panties when i put them back on. i just got back home and there was no blood on the liner or anything . i just took it off and i sat down to pee and it looked like i had just started my period . so . much . blood . keeping in mind that i just got off my period friday evening and we had sex 3 times saturday . right after we had sex and he came in me i took my pill so idk if anyone has any information on what may be happening there please let me know . i’m not bleeding anymore, only when i peed . this is my first time experiencing anything like this and i’m super confused .