OPK confusion

Nichol

So if I get a positive OPK and input that into the <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> why did my ovulation date not change?

For example I got a positive OPK on the 2nd and 3rd and glow still shows my ovulation days being the 4th? So if I had sex on the 2nd and 3rd and not the 4th I’m probably not pregnant 😔 I think I messed up 😖