help .... confused

Samantha
I believe I'm two days late for af , when I tell glow I haven't started my period it changes it and predicts me to start in another two days time !! Ok but then it also changes all
My fertile window where it was etc for this month ( November ) so I don't now know if we had sex in right window or I'm actually not due yet etc , usually glow gets it right for me within 24 hrs I usually have af at the door waiting - no cramping - if no show of af in morning I'm testing !!