⚠️⚠️Spotting after sex⚠️⚠️

Hello ladies! Quick backstory and then a question. I had sex 8 days ago. It was a little painful during certain positions so we had to stop and do others but I think that might have been because of a cyst. (probably put pressure on it causing pain) But I started bleeding, as soon as we noticed I went and got dressed to go home and within about 5min my underwear were covered. The heavy bleeding stopped the same day and then I had some super light spotting the next day. It’s been 8 days since then, I’ve had no pain and no other bleeding. Today I got slight cramps (nothing bad enough for pain meds or anything) and I just started spotting tonight. What are the possibilities and what would you recommend me do?

Side note: I’m on birth control and don’t get periods