anyone else finding glow inaccurate!?

Kat
Is anyone else using opks and finding that they aren't telling you your ovulating at the same time as the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> is?? I started testing a few days ago with my opk and it's been negative everyday even though glow is telling me I should be fertile !?