Well, what happens if fertilization does not occur is the inner lining that is developed during the cycle known as the endometrium begins to break down and it is discharged along with that secondary oicide in a process known as menstruation. And this is categorized by bleeding and by cramping. So this is what women experience on a monthly basis as a result of the fact that no fertilization of their excel actually takes place. So generally speaking, the menstrual cycle can be broken down into three phases. We have the follicular phase, we have ovulation and we have the luteal phase. Now the follicular phase is categorized by the development of the immature XL into the mature Xcel.