Advice on cramps...

So I know you're not officially out until AF shows but I'm having cramps. Every month since we've been TTC, I have began cramping at 6DPO. Sure enough it's that day and I woke up with cramps. Anyone else out there always get the same monthly cramping but ended up with a BFP anyway? We did a lot of things different this month because we really want it to be our month. If it happened, there'd be a big chance we'd be due on my husbands late fathers birthday.  Ugh... TTC makes me feel like such a failure sometimes, I swear.