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It would depend upon how the Nuvaring was started. If you were taking no previous hormonal birth control method and the NuvaRing was started on the first day of a period, then you are protected and no intervention is needed. If you were taking no previous hormonal birth control method and the NuvaRing was started after the first day of a period, i.e., day 2 or later, then it is recommended to use a back-up method for 7 days. The usual recommendation is to use condms during the sexual encounter, but since that did not happen, taking Plan B is the only option at this point. You do not take out the Nuvaring until it is scheduled to be removed.