Period. Help!

Adrianna

So I started taking birth control last week but that Saturday night I hung out with a guy I’ve been talking too and I gues you can say we tried it but not really cause he didn’t stick his dick inside me he was just moving it around and whatever and I’m pretty sure he pre cummed or something so now today I woke up with blood and it was pretty dark but now I’m just cramping really bad so idk if it’s from the birth control?