The ovulation period refers to the 14 days before the next menstrual period in a woman's menstrual cycle. This day is called ovulation, and it is also the day when women are most likely to get pregnant. However, the exact day of ovulation may be different for each woman because everyone's menstrual cycle and hormone levels are different.

A woman's menstrual cycle and hormone levels change over time. In pre-puberty, a woman's menstrual cycle may be shorter and hormone levels higher, whereas in late adolescence, a woman's menstrual cycle may be longer and hormone levels gradually decrease. In addition, a woman's menstrual cycle may also be affected by factors such as diet, exercise, and medications.

Therefore, to determine when ovulation occurs, women need to record their menstrual cycles and observe changes in hormone levels. If a woman wants to get pregnant, it is recommended that she have sexual intercourse near her ovulation period to ensure that the fertilized egg implants. However, women can also use other methods to determine the specific ovulation period, such as using a pregnancy test stick or having an ultrasound.