Bleeding after masturbating?!

Just wondering if this has happened to anyone before🤧

I’m currently 6 weeks pregnant. I masturbated this morning, afterwards I went to pee and there was so much blood there it was unbelievable. Freshly red too, so I went off to hospital completely past myself thinking I’d miscarried, to be there for 5 hours having tests done. Have to have a scan on Tuesday. Just had a vaginal examination, doctor said neck of the womb is closed. So that’s a good sign, they weren’t worried. I’ve came home and I’ve stopped bleeding? Anyone had this problem after an orgasm please let me know!!