If you are very eager to have a baby, then you should know the perfect time to conceive. This is important because not all women are aware of this phase in their 28-day menstrual cycle. Ovulation is the most important period that a woman should consider in order to get pregnant. This is the time when a woman is most fertile because a mature egg or ovum is released in the uterus. This makes fertilization by a sperm cell possible. There is a way for a woman to know when she will ovulate, or when she is ovulating. This is through the ovulation calendar. This calendar estimates the time when a woman will ovulate, or when a woman is actually ovulating. This is done by knowing the first day of the menstrual period and its length, and the last day and length of the luteal phase. Luteal phase begins after ovulation and ends before the first day of the menstrual period. For a woman who has a regular 28-day cycle, ovulation takes place on the fourteenth day of the cycle.