Irregular or abnormal ovulation accounts for approximately twenty-five percent of all infertility cases.
Ovulation normally occurs twelve to sixteen days before the onset of menstruation.
During ovulation, progesterone is released. Progesterone is the hormone that transforms the uterine lining into a receptive environment for implantation and nurturing of the fertilized egg. If a woman feels that she many not be ovulating normally, there are several tests she may take to determine the regularity of her ovulation. She may complete a basal body temperature chart by taking her temperature orally each morning for a month and recording it. The release of progesterone usually causes a point five to one degree rise in temperature.