Why am I bleeding?

My boyfriend lives in a different city and when he comes to see me we always do something sexual. Long story short we had sex 2 weeks ago and it was our first time, at the end I started bleeding a lot and it hurt my vagina when I went in the shower after. Two weeks later which is now, we’re having phone sex and when I finger myself a lot of blood comes out, it’s not my period for sure because it ended like a week ago but I’m really scared and I’m wondering if anyone has any idea to why I’m bleeding so much?