The endometrium does not thin after ovulation. The thickness of the endometrium will continue to thicken after ovulation, and the endometrium will only thin when a woman has menstrual bleeding because of the shedding of the endometrium. Because a woman’s ovulation day is about 14 days before her next menstrual period, her endometrium will continue to thicken between the end of her last menstrual period and the arrival of her next period, and the thickness of the endometrium can reach more than 0.8mm after entering ovulation, and ovulation will not disrupt the normal endometrial thickening, but will still continue to thicken until menstruation. If a woman becomes pregnant after having intercourse during ovulation, the endometrial lining will not thin, but will continue to thicken as the pregnancy lengthens, with some degree of fluctuation in the middle and late stages of pregnancy.