Late AF

Tashina
Every time I tell Glow my period is late (newish to the app), it just pushes it back two days. I am now a week late. Does Glow know something I don't or should I just take the test? Really don't want a "negative"... we've been trying since March and a negative test will make me feel... sad :/ (obviously happened before). Is it normal to be "late" when you're TTC?