What happens if I miss a menstrual period when Im using NuvaRing?
It is possible that you might be pregnant. Although Nuva Ring is not harmful if used while pregnant, you should make sure you aren’t pregnant before inserting a new one. If you left the ring out for more than three hours, took more than a 7 day break between rings, or left the ring in for more than four weeks, or have missed two or more periods in a row, you need to do a pregnancy test.