How do I log that my period didn't start?

Jami • 10 yr old boy, 18 month old boy, angel baby daughter, and B/G twins due in February.
So I have an Android phone and can't download Glow nurture but I want to be able to show in my period log that my period didn't start. It won't let me. HELP. All it does is let me move the marker to show that my period is one day long. How do I fix that?