Menstruation comes on the 12th and finishes on the 19th, and for women with regular periods, ovulation will probably be around the 27th. Generally speaking, as the follicle matures, it gradually moves toward the surface of the ovary and protrudes outward. When the follicle approaches the surface of the ovary, the surface cells there are weaker and eventually rupture, the follicular fluid will flow out and then the egg cells are discharged, which can be called ovulation. For women who usually have regular menstrual cycles, the date of ovulation will usually be 14 days before the next menstrual period, usually 5 days before and 4 days after the day of ovulation, together with the day of ovulation within the calculation, a total of 10 days can become the ovulation period. Calculation of the ovulation period is usually for women who have regular menstrual periods. If a woman’s menstrual period is not too regular, she can also monitor ovulation according to the symptoms of discharge and ultrasound, so as to clarify the ovulation period.