The lining will continue to thicken after ovulation. The menstrual cycle can be divided into three phases: proliferative phase, secretory phase, and menstrual phase, and the endometrium will continue to thicken after ovulation. 1. Proliferative phase: At this time, ovulation has not yet occurred, the endometrium is mainly affected by estrogen, and the epithelium, glands, mesenchyme, and blood vessels on the surface of the endometrium show proliferative changes, which is called the proliferative phase. 2. Secretion period: after ovulation, the endometrium enters the secretion period, the endometrium is affected by estrogen and progesterone, the endometrium continues to thicken, the glands grow and bend, and secretion phenomenon occurs, which is called the secretion period. 3. Menstrual period: the luteal body shrinks, and the withdrawal of estrogen and progesterone leads to the disintegration and shedding of the spongy functional layer of the endometrium from the basal layer, and the shedding of the endometrium together with the blood from the vagina, i.e., the onset of menstruation.