What happen f the girl always excrete out there egg cell to their vagina?

The way the anatomy of the female reproductive tract is prevents this. The only way it might happen is if the uterus is removed and the ovaries remain. The egg may end in the vagina. If the egg is excreted into the vagina and if fertilized, the embryo would be lost. If some how the embryo attaches to the wall of the uterus, it would also be lost. There is not enough room for it to grow.