What could this be?

Backstory- Me and the guy I’m seeing had sex multiple times Saturday night which may or may not be relevant. Then on Sunday morning I was bleeding (quite a bit enough to fill a super tampon) like I had started my period which would be 5 days early but doesn’t surprise me I have a lot of gyno issues. So I just figured oh well the sex probably induced my period and went on with my day. However, I only bled for not even a whole day, then by Sunday night I started realizing I was tender and having a little pain in my groin and what feels like a lump/knot. Overnight the pain got worse and now I feel so much pain and pressure when I walk or sit or bend down. I have major bloating and cramping, as well as low back pain.

When I search, the first thing that comes up is groin strain but I would’ve felt that right as it happened I think. My initial thought was kidney stones but then I realized all of this happened following the one day of bleeding so now I’m confused! I also have a history of ovarian cysts. Has anyone ever heard of this or experienced this??