19 weeks and bleeding

Me and My SO we’re having sex and it wasn’t rough or anything but then he noticed ALOT of blood.. basically like when your on your period.

I’m having some cramping but I assume it’s from my cervix being irritated.. I know sometimes you can bleed during sex but this seemed like a lot not light or spotty...

I’m gonna go to the doctor to get it checked out but Has anyone had this happen and it be fine?