Period is late, glow put period 2 days later

K

Hi there guys. My period was supposed to come today but it didn’t, so I pressed the “my period is late” button. Instead of telling me to test, it just said my period will now start on Sunday... is that normal?

Also, should I test today? I have a chemical hair straightening appointment tomorrow and I obviously want to cancel that if I’m pregnant. is this too early to test?

For background: we didn’t have sex in my “fertile window” so my chances are very low and I’m trying to stay realistic.

Wish me luck!!!