Most women get their periods at a thickness of about 1cm, but it varies from person to person. Some people may get their period at 5-6mm, while others may not get their period at 1.5cm thickness, so the thickness of the lining is not always the same, and the condition of the follicles and sex hormone levels can also affect menstruation. In addition to the thickness of the endometrium, the follicles in the ovaries should also be checked. Generally, the follicles are 1.8-2 cm thick and ovulation occurs about 2 weeks after ovulation. However, if you do not see such large follicles during the examination, but only some small follicles of 7-8mm, it is not clear whether you have ovulated or not, you can only guess based on the thickness of the endometrium. Some people have normal estrogen and progesterone levels, but the endometrium is damaged, so it does not grow thicker, and the endometrium may be 5-6 mm thick when menstruation occurs. Therefore, most women with endometrium of about 1cm will have menstruation, but it cannot be generalized.