Whether endometrial thickness of 6mm affects pregnancy depends on what period of the woman’s life the 6mm endometrium is in. Normal endometrial thickness fluctuates cyclically due to the cyclical changes of ovarian hormones. If this thickness occurs just after menstruation, it is normal and usually does not affect fertility. As the endometrium progresses to ovulation after menstruation, it can gradually thicken, and when it enters ovulation, the endometrial thickness is generally around 1.0 cm, which is conducive to fertilization. If a woman’s endometrium is 6mm during ovulation, it is abnormal, because this thickness of endometrium is not conducive to fertilized egg implantation and growth and development, which means it is not easy to get pregnant. When the endometrium thickness is 6mm during ovulation, it is recommended to go to the hospital to identify the cause and give active treatment for the cause, which in most cases will not affect fertility.