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"I take the Nuvaring continuously. I have to change my Nuvaring on Wednesday, May 26th. However, I am having surgery that day, so it is"

Yes, you can change your Nuvaring earlier than scheduled without affecting its contraceptive effectiveness. As long as a new ring is used within 7 days of the scheduled change date, the contraceptive effect should not be affected. However, you may experience menstruation in this case.