An endometrial thickness of 7mm may be about 1 week away from menstruation. Normally, endometrial thickness reaches 10mm to 12mm before menstruation, 7mm is usually in the secretory phase, and you may have to wait for about 1 week before menstruation. The secretory phase is generally referred to as the 15 to 28 days of the menstrual cycle, early secretion of the general endometrial thickness of about 5mm, secretion of the endometrial thickness of the middle of the endometrial lining of the further growth, to the secretion of the late stage that is, the 24 to 28 days of the menstrual cycle, but also the pre-menstrual period, the endometrial lining of the thickness of the endometrial lining can reach 10mm or so, will soon come to the menstrual period, at this time from the secretion of the early stage of about 1 week or so. However, as many women have different lengths of menstrual cycles, the endometrial thickness cannot be correctly estimated, but should be combined with other aspects to see whether menstruation can come.