This app is the most efficient Period, Ovulation and Fertility Calendar/Tracker, it can calculate and predict your Period, Ovulation and Fertility. FEATURES: Period tracker. Period, Ovulation, Fertility Calendar. Expected Period, Ovulation, and Fertility Calculator. Average Period calculator. Menstrual Cycle Tracker and calender. Average Menstrual Cycle Calculator. Menstrual Cycle. ADDITIONAL FEATURES: Light Application. Battery Friendly.