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I understand your concern. Normal menstrual cycle varies from 21 days to 35 days.So 21 day cycle can be normal.I hope this information will be helpful.If you have any query, please feel free to ask.Your satisfaction is my goal.If you are happy with my answer please click on 5 star rating so that I can get the credit for helping you. Wish her healthy life.Regards.
Yes, it can.
It is normal.