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anything can make a cycle change... breathing, exercise, lack of exercise, weight gain, weight loss, fatigue, stress... anything... by this age, her cycle should have fallen into some sort of pattern... but not all women do...
Has she been to a gynocologist yet? By age 20, I would hope so, especially if she's sexually active. Birth control will regulate her cycle... her irregularity is something that she should discuss with him/her.
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Free your heart from hatred. Free your mind from worries. Live simply. Give more. Expect less.
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