I'm on day 42 of my cycle with no period. I took a test two days ago with a negative result. I have been under very high stress and am not overly regular. When I tell Glow I'm late it keeps resetting my period due date...at what point should I be worried? Take another test? Make a doctor appointment? At what point does the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> stop postponing my due date and say hey.. something is wrong?