Dark Brown Discharge During Ovulation?

I got some dark brown discharge just randomly today and I’m a little afraid. I’m on Day 4 of my fertile stage.

The only thing that’s a little different lately is I’ve taken a few plan Bs for the past 2-3 months (not a lot) as I’ve been sexually active with someone new. But other than that, that’s it. This has never happened before and I’m a little afraid.

Any help? Thank you!