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• BY Mamie Doris 2018-06-03
  It is normal for the menstrual cycle to be short and long. The changing rule of the ovary is that the follicles have already developed when menstruation comes, and it is called "follicular period" before ovulation. It takes about 10 days; if not pregnant, the corpus luteum atrophy, estrogen and progesterone gradually withdraw, and menstruation will follow It is called "luteal phase" from ovulation to menstrual period. The entire cyclically changing time forms the menstrual cycle. Relatively speaking, the "luteal phase" is relatively stable and takes about 14 days. Therefore, the order and length of the menstrual cycle depend on the "follicular phase", and this period is the most susceptible to disturbance, which promotes changes in the cycle.
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