Help! AF is late but still no BFP

Carly
My AF was due yesterday(4/14). I tested to days before and got a BFN. So I was shocked when I didn't get my period yesterday! I am never late but if AF is gonna come a day early or late glow predicts it. And this month it was supposed to be the 14. I've been having some crap,nausea, and gas. I have no signs of AF. What should I do?