Ovarian cycle FSH LH FSH LH Early corpus luteum Regressive corpus luteum Mature follicle Developing follicle Follicular phase Ovulation Luteal phase Days 1 7 14 21 28 Menstrual cycle Progesterone Estrogen Progester 蓬分 Estrogen Days 19 21 23 25 27 Menstruation Proliferative phase Secretory phase Menstruation 02A