Glow not letting me add period

Sabrina🌸 • 🤵👰7/25/15 👧🏼12/6/13 👼2/21/15 👦3/26/16 👧6/27/18 I`m 26 and have 3 beautiful babies! Due with #4 September 2020

I go to edit to add my period that started today but when I click on the day, nothing happens. Can anyone tell me why?