Cramps and headaches

Glow puts this week as my fertile window but I have a feeling I actually ovulated a few days ago from checking my cervix. I've been having period like cramps for the last 2 days and have had such a bad headache too. I'm still in my predicted fertile window so the test I took today wasn't surprising when it was a BFN. I'm super anxious about testing again closer to AF. I'm hoping for some implantation bleeding to tell me I'm on the right track. Anyone else have these symptoms before and get your BFP?