Spotting outside of normal menstrual cycle

Hey if this is in the wrong place please let me know!

Let me start, I’m pretty close to ovulating (just a few days away) yesterday afternoon I was getting ready for a shower and something prompted me to look down at the floor. I saw blood on one of my towels. Instantly I started to panic because I’m not good with anything involving blood. I’ve never spotted anytime around ovulation. It wasn’t a lot but it was also a light pink color of spotting. And it was on and off the rest of the day. This morning I went for a short run and then noticed it had sort of started again, but the blood was brown showing that it was left over blood from the day before.

I’m 18, never even had a boyfriend so I know it’s 100% not pregnancy. Last December my gynecologist did say that I did have potential ovarian cysts from an ultrasound we did for something else.

Would anyone know what this could be? Or should I check in with my doctor?