Is this Normal😕?

So my boyfriend and I had sex earlier today. Everything was amazing, despite the fact that I haven’t gotten use to the size. It used to hurt me all the time but it’s not as bad now. After we finished we both ended up

going to sleep. When I woke up about an hour later, I went to the restroom and noticed spotting. I’m not pregnant, never been pregnant. I don’t take any type of medications regularly. I don’t drink or do any type of drugs. It’s not time for my period. I do have endometriosis so I feel like that could be why but I’m not sure. Is this normal? Should I be worried. It’s not the first time this has happened but that’s what concerns me more.