Bleeding/spotting mid cycle?!

Okay I need some thoughts. I had a normal period January 19-24. Today I am cycle day 18. I just got home from work and noticed brownish-pink spotting when I wiped. According to the app I should ovulate tomorrow which I don’t follow by because it’s never actually right for me. I have yet to get a positive opk.

I have been trying to conceive for a year. I have been taking fertility meds for a couple months.. this cycle I am not taking them because I had a cyst. So I’m confused as to why I’m spitting like this. I was thinking possible implantation but I don’t think I have even ovulated.