Although a woman is posterior to the uterus, as long as the sperm can pass through the cervix to the uterine cavity and the fallopian tubes and can unite with the egg to form a fertilized egg, she will be able to conceive. In rare cases, the posterior position of the uterus is so pronounced that the sperm cannot pass through the cervix and therefore cannot unite with the egg, and in such cases it is not easy to conceive. When a woman is unable to conceive due to the posterior position of the uterus, it is also possible to change the posterior position of the uterus into a neutral or anterior position by sleeping in a prone position or by manual repositioning, in order to facilitate pregnancy. The factors that cause women not to get pregnant are not only related to the position of the uterus, but also to ovulation, the smoothness of the fallopian tubes and the quality of the eggs and sperm.