The three phases of the menstrual cycle are–
Follicular phase, Ovulatory phase, and Luteal phase.
The ovulatory phase becomes most important in the terms of luteinizing hormone (LH) surge. In the follicular phase, at the beginning of the menstrual cycle, the follicle is developed. This cycle begins with the menstrual period, the shedding of the uterine lining and the shedding cleanses the lining of the uterus in preparation for ovulation during the ovulatory phase.