Ok ladies, Glow says my fertile window started yesterday and I've been using OPKs since CD7. I havent gotten a positive OPK yet but today, I've had horrible cramping! It literally feels like I'm starting my period but I'm only on CD17! I thought it could be ovulation pain but my cervix is hard and I haven't gotten a positive OPK. Could I have missed O? What could the pain be? I'm going to BD and keep testing just to be sure. I'm so so confused though!

Here's my cycle chart

These are my OPKs... the last one was from 11:30 today.