I tried to adjust my period log because it was supposed to start Saturday, September 27th but it didn't. I still haven't seen AF. So, I deleted my period on the calendar but the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> just bumps it down to the next week so they now show that AF will start on Saturday, October 4th. (Hope not!) Is this just the way it works or should I be able to delete that period all together so that my charts stay on track? I've been using glow for the past three months and my cycles are very regular.