Glow calendar keeps changing?

D

I'm having a difficult time ttc so I am trying this app. Problem is my cycles are sporadic, different each month and so I get a Glow projection for my fertile week, log like crazy but then when my period doesn't come when the app predicts, my fertile window and dates change! 😥. So even if we had sex the projected week of fertility, because by period didn't arrive in time the fertile week changes. ☹️