CRAMPS / PAINS 2DPO

Lucee
I definitely ovulated two days ago (OPK & BBT) but today I am having cramps / pains that feel really similar to ovulation pains. I have done two OPKs today just to make sure but they are very negative. I know it's way too early for implantation, does anyone know what this could be? I've never experienced pain after ovulation before. ?