Normal menstruation before the endometrial thickness of 10 ~ 12mm, if the endometrial thickness of 6mm, may be related to the woman in the pre-ovulatory period or endocrine abnormality, generally in 2 weeks ~ 1 month can come to menstruation, but due to individual differences and different treatment effects, can not be determined when the specific time to come to menstruation. 1. Women in the pre-ovulatory stage: at this time, the female uterine lining will gradually grow under the action of estrogen, and menstruation can generally be expected about 14 days after ovulation. 2. Endocrine abnormalities: If a woman’s work stress or combined with polycystic ovary syndrome and other gynecological endocrine diseases, due to the body’s estrogen and progesterone levels of the disorders, so it will lead to a thin uterine lining or no ovulation, so at this time to comply with the doctor’s advice to supplement progesterone or estrogen and progesterone preparations, to be discontinued within 1 week after the menstrual period can come. If menstruation does not come, gynecological ultrasound examination found that the endometrial thickness of 6mm women, it is recommended that they go to a regular hospital gynecology consultation, under the guidance of the doctor active treatment.