Number of reasons: Sometimes this type of bleeding pattern can be due to fluxuations in hormone levels of estrogen and progresterone. Sometimes they might be indicative of a lesion like a fibroid or a polyp in the uterus or cervix. If it bothers you, you may want to see a physician and discuss cycle control so that you always known when your period will be and how long it will last.
Answered 6/14/2013
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