If you leave NuvaRing in for six weeks without changing it, you could get pregnant. Insert the new one now. If you had sex in the last five days, consider using the morning after pill or getting a copper IUD inserted (the latter reduces the risk of pregnancy up to five days after sex, and provides ongoing Birth Control that's highly reliable and reversible). Use a backup method of birth control until you've used the ring correctly for seven days. Take a pregnancy test if you don't have bleeding when you next take your ring-free week break.
NuvaRing remains effective for up to four weeks after inserting it. If you leave it in for the four weeks, though, be sure to insert the next ring at the end of the four weeks; don't take a ring-free week unless you had it in for just three weeks.
five weeks, with five days left over to start the sixth week
If you removed your NuvaRing a week early, put in a new ring now.
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Remove the NuvaRing, replace it with a new one, get a pregnancy test if you've had intercourse during the previous four weeks, consider emergency contraception if you've had intercourse in the prior 72 hours, and consult your health care provider.
If you inserted NuvaRing during your period, you're likely to bleed again in two to four weeks.
If you insert NuvaRing eight days late, you are at risk for pregnancy. Use a backup method for at least seven days. Timing of your next episode of withdrawal bleeding will be unpredictable. Take a pregnancy test if you had sex that wasn't protected due to the error in NuvaRing use. Consider changing to a method that doesn't require you to do something every month.
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If you leave the last NuvaRing in for four weeks, insert the new one immediately. If you did not insert it immediately, you must use a backup method until you've used the ring correctly for seven days.
I found this on the NuvaRing website http://www.nuvaring.com/Consumer/patientSupport/nuvaRingHelp/index.asp?ComponentID=76346&SourcePageID=74639#1 I hope it helps. If NuvaRing
If you leave out NuvaRing for a day, replace it with a new ring and use a back up method of birth control, like condoms or abstinence from vaginal sex, for seven days. It is best not to remove NuvaRing until the ring-free week.
You insert NuvaRing in the vagina.