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Your hormone level is fluctuating which is why Doctor has prescribed contraceptive
pill to regularize your hormones. If you have blood passing in your urine you need to get tested dear. Usually bleeding from vagina can occur during and after stopping the pills it can be expected. But if you are having bleeding in urine it could be due to stone, urinary infection for which your urine needs testing. Drink plenty of water. Consult your Doctor and get a thorough checkup.