Early AF can someone help

Vikki
My AF was a day early this month but lasted a day and a half very light...
<a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> doesn't give me the option to say it was early and then hasn't reproduced my AF due date for next month 
Can someone help? My cycle is 30days 
💜💜💜💜
AF was 29/12/15