Totally confused

Glow said my AF was supposed to come on the 2nd it never showed so it changed the date to the 4th I took several pregnancy test but keep getting a BFN I haven't had any symptoms other than nausea for the last 2 days. I usually get breast tenderness before AF arrives but I didn't this cycle..I'm confused as to what's going on could I be pregnant and it's just to early for me to test..HELP!!!