Always Blood After Sex

I’m 18 and my boyfriend and I have been having sex for about 6 months now. We don’t do it everyday day, maybe 2 or 3 times a month because obviously we’re young and it’s hard to find an opportunity to. Anyways, ever since we started having sex or he would finger me, there’s always blood. Always when I go to the bathroom after and wipe sometimes it’s dark brown and sometimes it’s red. In the beginning I thought it was fine because I’d never done any of it before! I don’t know if this is happening because he’s going deep and hard or because it’s not super often that we’re having sex. I just don’t know if this is normal do any help is appreciated, thank you!