Glow has my cycle all kinds of messed up. It's frustrating, you should allow us to put in our known cycle lengths, I know when I ovulate between day 14-15 and I have an 18 day luteal phase but the app is trying to force me on a 14 by 14 cycle if it's not then it's telling me I ovulate on day 21 which I don't and that has been confirmed by medical tests. Your app is all kinds of messed up in it's calculations. Ovia took 1 cycle to catch on, glow hasn't in 3 cycles. Allow us to input our known numbers already.