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You are having frequent and less volume bleeding cycles which can indicate some problem in ovaries/uterus
. Better to consult a Gynaecologist to rule out problems like ovarian cyst
. Better get a PAP smear
also done for safety to rule out cervix
problems. Gynaecologist will give you medicine to regularise your cycles using probably OC pills which is effective but first certain tests need to be done to see no major pathology is there.