See MD: Irregular menstruation can be caused by several factors, exercise, stress, obesity, medical conditions, PCOS etc, in a young woman your age the most important question is whether you are sexually active unprotected because pregnancy is very important to consider. Menstrual periods are 28 days apart, if you are sexually active around day 14 when you ovulate could be implantation bleeding, see MD
Answered 2/26/2018
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