Period symptoms while ovulating..?

I've been keeping track of my period (since there's an app for that) for a couple of years now. I've had a regular period (generally within 3 days of when the app said I would be getting my period).

I got my last period on time, though it came a few days early (on the 5th) and it ran a day or two shorter than my normal six days. Now I'm supposed to be ovulating, but since Sunday I've been having brown/red blood (mostly brown, like old blood, and it's not a heavy flow... more like heavy spotting) with clots and very mild cramps. I'm not on any medication. I did work a ton of overtime last week, so I don't know if the extra stress could have something to do with it..? And other than a hint if cramps, there's no pain.