Here is the translation of the provided text into English: "Two days before menstruation, how thick is the endometrium?"

Patient's question:

No

Doctor's answer:

The normal thickness of the endometrium is 8—12mm, and a few days before the menstrual period, the endometrium thickens. Generally, the menstrual period should exceed 10mm; both being too thin or too thick can affect menstruation.