For a woman who wants to know the perfect time to get pregnant, she should have knowledge about ovulation and when it actually occurs. Every woman experiences ovulation during her 28-day menstrual cycle. This is the time when she is most fertile, which means that she has the greatest chance of getting pregnant. She can monitor this on her own, or by using anovulation calendar. The important things that she has to know include the first day of her menstrual period and the length of menstrual bleeding, and the last day of the luteal phase and its length. Luteal phase is measured from the day after ovulation and ends before the first day of the menstrual period. A woman is usually fertile at the fourteenth day of her menstrual cycle and three days before and after ovulation. But it is important to take note that ovulation calendar is applicable only to women who have regular 28-day menstrual cycles. Other than that, a woman cannot have the right estimation for ovulation.