A handy program that calculates the time of ovulation and creates your personal fertility calendar, allowing you to increase your chances to get pregnant, avoid an unwanted pregnancy, or choose the gender of your future baby. Free download. A handy software utility designed to predict the days that you are most likely to be fertile so that you can achieve pregnancy or prevent it. Several key dates about your menstrual cycle are displayed including a range of fertile dates, ovulation, end of menstrual cycle, and possible due dates. It can also help you specify the gender of your baby and her zodiac sign. Designed in consultation with women physicians, Ovulation Calendar Pro is a software that calculates the time of ovulation and generates your personal fertility calendar. Simply enter the length of your menstrual cycle and the date of your last period, and Ovulation Calendar Pro will calculate your fertile days.