According to the normal menstrual cycle, if the uterine lining is 9mm thick, you should have your period in about a week. The human endometrium changes with the menstrual cycle and is not always the same. The endometrium is at its thinnest just after menstruation, and most people have an endometrial thickness of about 2-3mm. With the arrival of ovulation, the endometrium gradually thickens to 10mm, while the endometrium is 9mm, if the usual menstruation is regular, it should be in a week or so should come to menstruation, so do not worry too much. In addition, women should pay attention to nutritious diet in their daily life, exercise properly, avoid staying up late with irregular work and rest, avoid straining and mental stress, and keep their emotions stable and happy, so that their menstruation and endocrine secretion will be stable naturally.