Menstruation ahead
Early menstruation: The menstrual cycle of normal women is about 28 days. If the menstrual cycle is always more than 7 days in advance, or even two menstrual cycles within a month, it is called "premenstrual period", also known as "premature menstruation" "Or" Early menstruation. " If it is only 3-5 days ahead without other obvious symptoms, it is a normal range. Occasionally ahead of time, not even menstruation.
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