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Every month there is a small window of opportunity for a man and women to conceive, so timing is very important. An egg can be fertilized for a maximum of 24 hours after it is released from the ovary, according to pregnancy and childbirth expert Sheila Kitzinger. Therefore, a woman needs to understand how her menstrual cycle works and make an educated guess about when she will release an egg, also known as ovulating.
Fertilization Egg is released from the ovary and enters the fallopian tube in the direction of the uterus. It reaches the center of the tube in around 30 minutes. If sperm (in semen) have been deposited in the vagina within 24 hours of ovulation, there is a 3 day window in which fertilization can occur.