By stopping NuvaRing, you are essentially restarting it as if it was your first month using it.
As long as the Nuvaring insert is started within 5 days of the first day of your last cycle, you are considered to be protected from pregnancy after 1 week of use. If you insert NuvaRing on Day 1, it is not necessary to use an extra method of birth control.
I hope this clarifies things.
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