When would you test?

Meri

My average cycle is 27 days. The shortest cycles however have been 25 days. Glow estimates that AF arrives cycle day 31, because I ovulated late this cycle - on cycle day 16 or 17.

When would you test? Of course the simplest solution would be to wait until cd 31 or a few days more, but I can't help myself. 🙈😂