Scared

So I got my period a week ago and it was lighter than usual but lasted 7 days like usually, and a week after that I re got it and it’s way heavier ( I took plan b 3 days before it recame idk if it has anything to do with it. Is it normal should I be worried. Also me and my bf just started having sex and I heard about people having their period when pregnant. So I’m kinda freaking out. Please let me know

We had sex today too but we used a condom and it didint break. I just freak out about being pregnant I need some reassurance

I’m not pregnant right