That's because it's estimating when you would be ovulating, if you weren't on birth control.
2 Answers · Pregnancy & Parenting · 17/05/2015
I was on those same exact pills few years ago. After taking them for several months, periods got even more irregular to the point I had no period for over 6 months. So I dont take it anymore...
1 Answers · Pregnancy & Parenting · 06/12/2014