Glow accuracy?

lauren

So my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> tells me af is supposed to arrive 10-13 - another app tells me af is to arrive on 10-10; who all found glow to me most accurate? I was taking tests according to my other app and hoping that that’s why they’re negative but wondering if I should go by glow?