Whether you and your partner practice the rhythm method or use ovulation predictors to get pregnant, ovulation goes unseen. The American Pregnancy Association reports that the egg lives only 12 to 24 hours after leaving the ovary. It said:

Ovulation occurs when a mature egg is released from the ovary, pushed down the fallopian tube, and is available to be fertilized. The lining of the uterus has thickened to prepare for a fertilized egg. If no conception occurs, the uterine lining as well as blood will be shed.

Inserted through a cut in a woman's vaginal wall, an endoscope shot the first video footage of the biological process.