I'm very in tune with body and monthly calendar and I checked and rechecked...this month Glow had my fertility period ENDING when in actuality I was right smack in the middle. Even <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> showed I was on day 14 but also showed I had my last fettle day. Is day 14 the typical ovulation date. Just be careful anyone TTC