I thought I got over my period Saturday, I was barely even spotting. I had sex for the first time that night with my boyfriend whose penis was rather big. I was bleeding a lot during and now I haven't stopped bleeding since. Is this normal?

Its your hymen, the skin that is inside your vagina and when you have sex for the first time it breaks, also called poppin your cherry, I don't know how long its suppose to bleed for, but if it gets anything more then spotting or maybe even up to kind of like normal flow period, talk to your doctor
Hope this helps