The timing of menstruation in women with an endometrial thickness of 0.7 cm is variable, with most healthy women menstruating in 2-3 weeks. The thickness of a woman’s endometrium is cyclical and varies with the cyclical secretion of hormones by the ovaries and the hormone levels in the body. When menstruation ends, the endometrium is at its thinnest, around 0.4cm, during ovulation the endometrium is about 0.6-0.8cm thick, and by the time menstruation arrives the endometrium reaches its thickest, around 1cm. Therefore, in normal women, when the thickness of the endometrium is 0.7cm, they are in the ovulation period or early secretion period, so they have about 2-3 weeks before menstruation. However, endometrial thickness is mostly measured clinically by ultrasonography, and there are human errors, so it is not completely accurate to judge the time of menstruation by endometrial thickness. In addition, when women have gynecological endocrine diseases, the endometrial thickness cannot determine the time of menstruation. 0.7cm may not come for a month, or it may come at any time, or there may be irregular vaginal bleeding all the time. Therefore, if you have irregular menstruation, you should seek medical attention.