Ovulation Cramps?

Darya
I think I have them, but I'm not sure. I've been having this naggy feeling in the bottom left side of my abdomen. I am in my fertile window and am supposed to ovulate tomorrow (01/13/16). Took an OPT last night and it was negative. Gonna take one later today. ANYWAY, have you ladies ever gotten them? What do they feel like? Def not as bad as period cramps.