Worried

Last night I had sex and this morning I woke up bleeding and my shorts ruined. I wasn’t in any pain, I’m just confused. It wasn’t my first time and it’s happened a couple times before but it was never as bad as it was this morning. I plan on talking to my doctor but in the meantime I wanted to ask and see if anyone may know what’s going on. I’m not bleeding anymore it stopped after I noticed this morning. It’s also not my period.