Calendar-based contraception method for natural birth control
Calendar-based contraceptive for birth control, this app's calculator can estimate fertile and infertile days, and have two methods,
First Knaus–Ogino method, known as rhythm method to calculate for women who have an irregular menstrual cycle,
second is standar days method for women who have a regular cycle or have an average menstrual cycle between 26 ~ 32 days .
