You have a number of options:
If an accidental pregnancy occurs, the Nuva Ring should not cause a miscarriage.
There's no need to stop using hormonal contraception, including Nuva Ring, for as long as you don't want to get pregnant. Nuva Ring and other hormonal birth control methods have no effect on future fertility.
Pregnancy is possible, but Nuva Ring is a highly effective method. Pregnancy is unlikely in the situation you describe.
Nuva Ring reduces the risk of pregnancy while you use it. After stopping Nuva Ring, women do not have a decrease in fertility. 85% of couples using no pregnancy prevention will get pregnant within a year. This number is the same for couples who have used Nuva Ring, and for couples who never used hormonal birth control.
For women who had regular periods before using Nuva Ring, ovulation resumes two to four weeks after stopping the Ring. 85% of couples will get pregnant within the year after stopping Nuva Ring.
Not effective at all, I was a week late on the neuva ring and got pregnant!
If you used Nuva Ring correctly in the previous three weeks, there is no increased risk of pregnancy during the ring-free week.
If 1,000 couples use Nuva Ring perfectly for a year, three will get pregnant. Since there are no perfect couples, pregnancy rates with typical use are higher than that, but there are no good data to date on typical failure rates with Nuva Ring. It's probably lower than typical failure rates with the pill, for which 8 pregnancies can occur among 100 couples using the pill for a year (higher for teens). After stopping Nuva Ring, women get pregnant at the same rate as women who never used Nuva Ring. It does not impact future fertility.
After you take out your last Nuva Ring, you'll probably have your usual withdrawal bleeding. After that, your next period will probably come in 4-6 weeks, if you were regular prior to using Nuva Ring. If your periods were irregular before the ring, they'll probably return to their irregular habit after you stop the ring.
If you had the Nuva Ring in for at least seven days, you had protection against pregnancy. There's not enough information given to know if you took birth control pills correctly, or if more than seven days passed since stopping the last pill and starting the new ring. Making mistakes with those steps would also increase your risk of pregnancy.
No, Nuva Ring doesn't lead to bacterial vaginosis, and it should not be removed and washed daily. .
Yes. Some women will experience a significant reduction in menstrual flow, sometimes to the point of absent or spotty withdrawal bleeding, but most women continue to have monthly withdrawal bleeding on NuvaRing.