The ovulation period occurs on and after the ninth day of menstruation, which is an important period in the female reproductive cycle. During this period, a woman's eggs begin to be released from the ovaries and travel through the fallopian tubes into the uterus, where they are ready to be combined with sperm to form a fertilized egg. However, only at this time can a woman's eggs truly mature and begin waiting for fertilization.

1. Observe the menstrual cycle: A woman’s menstrual cycle usually lasts 28 days, but everyone’s cycle is different. Observe your menstrual cycle, determine the time of your next menstruation, and deduce 9 days forward on this basis, which is the ovulation period.

2. Measure basal body temperature: A woman’s basal body temperature changes with the menstrual cycle. Under normal circumstances, a woman's body temperature will begin to rise on and after the ninth day of menstruation and reach a peak within a few hours, which is the ovulation period.

3. Use David test strips: David test strips are a commonly used test tool for measuring ovulation. On and after the ninth day of menstruation, insert the test strip into the urine. If the test strip shows two lines, it is considered positive.

In addition to the above methods, you can also observe your own symptoms, such as breast swelling, nausea, changes in appetite, etc., or consult a doctor to determine your ovulation period.

The ovulation period occurs on and after the ninth day of menstruation, which is an important period in the female reproductive cycle. Only at this time can a woman's eggs truly mature and begin waiting for fertilization. Therefore, we should cherish this precious period and arrange romantic dates or other love-related things as much as possible.