Shows the fertile days taking into account possible variations in your menstrual cycle, helping you avoid an unwanted pregnancy. ACIO Ovulation Calendar is easy-to-use personal ovulation calendar of menstrual cycles, fertility and ovulations. It helps you to achieve or avoid pregnancy, or even enhance gender prediction. ACIO Ovulation Calendar helps you use a natural contraception method. It shows you the fertile days, ovulation days and predicts your baby's gender. You will be able to view the results in a color-coded ovulation calendar.