A woman's menstrual cycle is divided into several stages. When the period ends, the follicular phase begins. At this stage, the follicles begin to enlarge and mature. Around the middle of the menstrual cycle, i.e. around day 14, the ovulatory phase occurs.
The ovarian follicle that has reached final maturation will release the egg from within and travel down the fallopian tube awaiting fertilisation. Finally, the follicular phase takes place. If the egg has not been fertilised, it will degenerate and a new cycle will begin.