Lately I have been having weird tightness and cramping in my stomachs area, I took a test to early and got BFN and my next AF is in 6 days accourding to this app.... What could that be? I'm tired all the time bad headaches and also big fat appetite. We are trying to conceive have been at least 3-4 times a week since the 4th which was my last day of my pervious period. Any thoughts?