12 dpo on 25 day cycle- af like cramps

Today I'm on cd 22 and I'm having horrible af like cramps and I know they're af like because I keep searching for blood, I also had diarrhea (sorry for tmi). Which I always have during af. I'm not due for another few days but I'm wondering what's the deal. My cramps were way milder yesterday. Is this a good sign?