What happen if there is no fertilization?

If fertilization does not occur, the egg will not implant in the uterus and will eventually disintegrate. The hormonal changes that are triggered by fertilization will not take place, leading to the shedding of the uterine lining. This process culminates in menstruation, where the body expels the unfertilized egg and the thickened uterine lining. Essentially, the cycle resets, preparing the body for the possibility of future fertilization.