Menstruation is the period of ovulation

Under normal circumstances, a woman's menstrual cycle is determined by the release of eggs from the ovaries. Every month, the ovary releases a mature egg, which enters the uterus through the fallopian tube, combines with sperm to form a fertilized egg, implants and develops into a fetus.

However, in some cases, a woman's menstrual cycle may be affected by factors such as work stress, mood swings, diet, and medications. These factors may affect the function of the ovaries and fallopian tubes, preventing eggs from being released and entering the uterus properly.

Therefore, in order to accurately predict a woman's menstrual cycle and ovulation, doctors usually predict a woman's ovulation by observing her menstrual cycle and laboratory tests. During ovulation, a woman’s eggs mature and are released, which is an important period for women to become pregnant.