If you want to become pregnant, an ovulation calendar can help you to map out the best times to try for a baby.
Ovulation refers to the release of an egg from a woman's ovary, and tends to occur about 14 days before the start of your next period. You are most fertile around the time of ovulation. While an egg survives for only about 24 hours after it has been released, sperm commonly live inside the female genital tract for about 3 days (and sometimes for up to 5 days). This means that sperm deposited in the genital tract several days before ovulation can be alive and can fertilise the egg when it is released.
Last Reviewed: 20 January 2006