Ovulation is not menstruation. Menstruation is the process of releasing an egg from a woman’s body once a month, and the ovulation period refers to the period within a few days after the egg is released, when the concentration of hormones in the woman’s body reaches its peak, and it is also the period when women are most likely to become pregnant.

For women who do not menstruate, their menstrual cycles and how they are calculated are different from those of menstruating women. They need to understand their cycles and health status by measuring basal body temperature, observing vaginal secretions, and observing menstrual cycles and amounts.

In addition, in addition to the ovulation period, women may also release eggs on a few days every month, such as the fifteenth day of the first lunar month, or around the twentieth of each month. These days are also known as women's dangerous periods. If a woman is fertilized during the dangerous period, she may become pregnant.

To sum up, ovulation is not menstruation. For women without menstruation, they need to use various methods to understand their cycles and health status, as well as monitor dangerous periods to avoid pregnancy.