Brown discharge around ovulation

My cycle is typically 31-36 days. According to Glow, I should be ovulating anytime between yesterday and Friday. Today I have been experiencing mild cramping (feels like period cramps) and brown discharge that looks similar to the spotting that occurs usually before I get my period.

I’ve been taking OPKs the last 4-5 days and they have been negative. My cervical mucus has also not been egg white, though yesterday and the day before it was quite watery. Wondering if anyone has experienced this or has thoughts about what could be going on. If it weren’t for the negative OPKs and non egg white CM, I would’ve just attributed it to ovulation bleeding, but now I am unsure.