Is it okay to have your period for two months?

that sucks! 3 weeks would be fairly irregular, but I would see a doctor just in case. *** Not at all! If your periods continue for more than a week, ideally it is not ok. If this happens for more than two consecutive months, you need to see a doctor. Also in teenage years, it is quite possible that you may have irregular periods due to hormonal changes. Even in that case, you should see a doctor.