1.The average menstrual cycle lasts 28 days when counting from the first day of one cycle to the first day of the next cycle. Eighty percent of cycles occur within 21 to 45 days. Typically, cycles will last two to seven days.

2.Some Medical Terms. A girl's first menstruation is called menarche. This is pronounced MEN-arc or MEN-arc-y. When a girl passes certain milestones in her development, but does not start having periods, this is called Primary Amenorrhea.

3.The luteal phase begins after ovulation. It lasts about 14 days (unless fertilization occurs) and ends just before a menstrual period. In this phase, the ruptured follicle closes after releasing the egg and forms a structure called a corpus luteum, which produces increasing quantities of progesterone.

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