Ovulation cramps PP.

I was extremely crampy the last two days. I noticed a difference in my CM (fertile cm) and checked my app and I’m supposed to be obv around this time according to the app. Granted, I know it can be off and it’s just a guesstimate. My question is this is my second cycle PP and I’ve never been crampy during obv. Is this normal and just due to being super fertile PP? Anyone else experience this? I’m in no way trying to get pregnant and haven’t even BD since I realized I’m in my fertile window.