As of today I’m 3 days late! Tested yesterday and got a BFN. Not even the faintest line. When should I test again.. or could there be other reasons for AF being late?

I did just move from Arizona from New Mexico July18th. Maybe that’s it?? I haven’t really been stressed either.. my sleeping schedule did change also... not by much. I just wake up earlier is all. I just don’t understand why this must be so hard. Af is ALWAYS spot on time. And the one time and I get a negative 🙄🤦🏽‍♀️😔