The thickness of the endometrium is 7mm. Whether the endometrium is normal or not at this point should be considered in the context of the different menstrual cycles a woman has at this point in her life. Under normal circumstances, the thickness of the endometrium is 4-5mm in the first 4-5 days after menstruation. As the menstrual cycle progresses and estrogen continues to act, the thickness of the endometrium is between 7-8mm before and after ovulation. In the 7-8 days after ovulation, due to the gradual increase of progesterone, the endometrium will show obvious secretory response, and the thickness of the endometrium will be between 8-10mm at this time. The thickness of the endometrium is at its thickest during the 7-8 days after ovulation, which is also the most suitable for the fertilization of the egg. If the corresponding endometrial thickness is significantly lower than normal, it will affect the corresponding fertilization rate.