Well that's what I want to do, is shorten my period.
The directions say to keep it in for 21 days, then take it out for 7, making it a grand total of 28 days. What I want to do is keep the ring in for 23 days, and have a 5 day period. This is possible only on the assumption that the ring contains a total of 28 days of hormones.
Talking with Nuvaring professionals, they said I could only use as directed, and advised against anything but 21 days in, 7 days out. But my mood swings are so bad in the ring-free week.....
Really I follow everything to the letter. I think they make the pattern so, of course on safe effectiveness, but also because it's easy to remember and a set scheledule. But I keep a very tight scheledule with my birth control, and do not deviate from it.