I have two <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a>. This one and the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a>. This one says I'm ovulating ans fertile but my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> one says it wont happen for another week or so. So which should I go off of?