The thickness of the uterine lining at the time of fast menstruation is 5mm, in which case it is usually difficult to conceive. Even if you get pregnant, it is easy to have miscarriage with aura, biochemical pregnancy and other adverse phenomena. A woman can get pregnant when her uterine lining is around 8~12mm. A thin uterine lining is not conducive to the attachment of a fertilized egg, and the chances of getting pregnant are low. Even if pregnancy occurs, it will affect the growth and development of the fetus, which may easily lead to miscarriage with preeclampsia and other undesirable conditions. Especially before menstruation, the uterine lining is usually about 10~12mm thick, at this time the lining 5mm is too thin, the chance of pregnancy is relatively small. Thin endometrium has a greater impact on women’s fertility, so it is important to go to the hospital in time for examination and treatment under the guidance of the doctor to promote a successful pregnancy.