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maybe because youe missed those otha periods

and my sister had the same thing i dont think you shudd be worried.

i wouldnt worry that much about it i used ot be like you and mine eventually sorted its self out.I wouldnt worry unless it for longer then about 9-10 days and still heavy

Yes Nikki..I would be concerned since it's not your normal period. It would be better if you saw your Dr.