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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.
Your question is missing some information, like the location of the blister, but I can't think of any way that a blister would be related to Nuva Ring. Please see your health care provider in the next two days if the blister is in the genital area.
Since you reinserted NuvaRing two days late, there's a chance you could be pregnant. Take a pregnancy test, and use a backup method of birth control until you've been on the ring for seven days. if you don't get a period after removing NuvaRing, repeat the pregnancy test. If it's negative, insert the new ring.
It sounds like you are not pregnant. I hope you restarted the ring, and used a backup method for the first seven days, so that you can continue to protected yourself from unintended pregnancy.
It is not bad to take out the Nuva Ring mid cycle. The only real risk is a little more unscheduled bleeding during the following two weeks, and, of course, the risk of unintended pregnancy. If your periods are irregular (i.e. some more than two weeks late) six months after using Nuva Ring, it's too late to attribute the problem to the Nuva Ring. Please contact your health care provider to discuss the problem. Be sure to bring a good record of the timing of your periods in that time.
Irregular bleeding in the first three months of using hormonal birth control like Nuva Ring is common, although it happens less often with Nuva Ring than with the pill. If unexpected bleeding is still occurring in your fourth month on the ring, or if you have other symptoms, contact your health care provider.
If you've used the ring correctly, haven't started any new medications or herbs that may interfere with the ring, and aren't at risk for infection, there's no concern about spotting with NuvaRing in. Talk with your health care provider for advice specific to your situation.
When you take out Nuva Ring for the last time, you'll probably experience your usual withdrawal bleeding. After that, usually your next period is in 4-6 weeks. If you were irregular before using Nuva Ring, you will probably go back to that irregular habit after Nuva Ring.
If your Nuva Ring falls out, you should rinse it in cold or lukewarm water and reinsert it. If it was out for less than three hours, no backup method is needed. If it was out for more than three hours, you should use condoms or abstinence from vaginal sex. If you've lost the ring altogether, then you should insert a new ring, leaving it in for three weeks and taking it out after 21 days, on the same day of the week you put it in. What you should not do is wait until after bleeding stops to start the new ring. Just use it on schedule, according to the calendar, regardless of any bleeding.
Your period may stop after inserting NuvaRing, just as your period may stop after starting a new pack of Birth Control pills.
Leave it in for three weeks, as usual, but don't rely on it for birth control until you've used it for seven consecutive days.
Many women note that bleeding starts later in the ring-free interval than it did if they were on birth control pills previously. Continue using the ring on schedule. Periods are always shorter on combined hormonal birth control like the ring as well. In addition, when you inserted the new ring seven days after removing the old one, that was likely to decrease bleeding further. (You did insert the new ring on schedule, right? If not, insert it now and use a backup method of birth control until you've used the ring correctly for seven days.)