Only 6 DPO & AF is here. Please help! What is wrong with me?

Caitlin
I really thought we would get pregnant this month. All the signs were right. I got a positive OPK on 1/17 and felt ovulation cramping that night. And had EWCM at the time. Now 6 days later, AF shows up with no warning. How is that even possible? What is going on? Please help me.