Period log

Hiya. At the beginning of Feb I changed from TTC to Thinking about TTC. 
I have entered my period for Feb  around ten times now. Everytime I enter it and the press save it shows on the period log but when I leave the page to go back to normal Callander it doesn't show, so I go back to the per food log and it's gone. 
​Can anyone help with why this is happening. I want to know when my next period is going to be.