What is ovulating?
The egg is released from the ovary 12-17 days after the first day of the last menstrual period. It is viable for approx. 12-24 hours, the sperm is viable for approx. 72 hours, so the most fertile period is the three days prior to ovulation. If it is fertilized (usually in the fallopian tube), it then will implant in the wall of the uterus 5-6 days after ovulation.