Endometrium of 6mm will not be pregnant. The endometrium of pregnancy should be at least 8mm or more, because the change of endometrium is influenced by estrogen in women’s body, and estrogen can promote the proliferation of endometrium in women. If the endometrium of a woman is thickest before her menstruation, which is 8mm-10mm, and if the patient does not have a period and goes to the hospital for an ultrasound and finds that the endometrium is 10mm or more, she should suspect that she is pregnant, so she can go to the hospital for a blood test or check her own urine to see if the chorionic gonadotropin in her body is higher than normal. If it is higher than normal, pregnancy can be diagnosed. If the lining is thicker and the menstruation does not come, you can wait a few days.