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If you have been sexually active; having spotting;with delayed periods then get a urine pregnancy
test done preferably with a first morning sample of urine to rule put pregnancy.If you are not sexually active & you have this problem then it could be a hormonal
imbalance;a ovarian cyst
or any other problem which will require investigation.So please consult a Gynaecologist who will examine you;advise investigations and treat you.