The ovaries produce the egg cells, called the ova or oocytes. The oocytes are then transported to the fallopian tube where fertilization by a sperm may occur. The fertilized egg then moves to the uterus, where the uterine lining has thickened in response to the normal hormones of the reproductive cycle.
A what you expect to happen
It would be Newton's "3rd" Law that explains why my hands hurt when I clap loudly, since this states that every action as an equal and opposite reaction.