To test or not to test?

Lacy
Hi all, new here and tomorrow would be 3 days before Glow says I should start my period. Wondering if I should just wait to see if and when it's accurate for my period to start and if it doesn't come, then test, OR if I should try testing anyways ahead of time.... We only were able to have sex once and it was 3 days before my peak ovulation, so chances are slim, but you never know.