Whether or not a small uterus will affect pregnancy depends on the specific circumstances, as follows:1. If the uterus is just a little bit small, but the ovary function is normal and the thickness of the uterine lining is normal, you can have normal, regular menstruation, and there will be mature follicles discharging eggs every month, then it won’t affect the pregnancy, and there’s no need to worry about it too much. 2. If the uterus is smaller than normal, the symptoms may be due to uterine dysplasia or malformations of the uterus. Uterine dysplasia and malformation will affect the normal thickness of the uterine lining, which will also affect normal menstruation, resulting in menstrual disorders or low menstrual blood flow. If the lining of the uterus is not able to develop normally, even if the ovaries have normally matured eggs, the eggs and sperms will not be able to form a fertilized egg, and will not be able to attach to the uterus, so pregnancy will be affected.