Pregnancy Risks: NuvaRing & Withdrawal Method - What Are Your Chances?

Question
What are the chances of getting pregnant if your girl is on nuvaring combined with the withdrawl method?

Answer
Dear Wondering,
The chance of pregnancy on the pill or NuvaRing is 1 to 8% for a couple in a year.  The chance of pregnancy using withdrawal only is about 25% in a year.  So although withdrawal adds a little for pregnancy prevention, it's not that much.  It's more important to use the ring correctly, which increases the protection toward the 1% range.