I have no idea what's going on🤔

Okay so I know this is gonna sound tmi but I just finished my period on the 16, I'm on the pill and just this past Friday my boyfriend and I had sex and after it was all done he noticed there was blood, and really I just haven't stopped bleeding ever since then. I'm just so lost I don't know what's going on this hasn't ever happened to me before at all😕