Q: When I am using an ovulation predictor kit, when is my most fertile time for intercourse?
A: The brain detects the presence of a mature or ripe egg by the ovary's production of estrogen. This occurs approximately 36 hrs. prior to ovulation. Once the brain has received the ovary's message; it sends back a message to the ovary telling it to complete the maturing process and release the egg. Thirty six hours after the brain's message (LH surge); ovulation takes place. The ovulation predictor kit detects the LH message 24 hours before ovulation. The most fertile times for intercourse are the day of LH surge and the day after (day of ovulation). While the sperm can live for several days; the egg lives for only 24 hours.