I don't know anything about the Nuvaring, but I have heard that you shouldn't use an IUD unless you have given birth previously. Not sure why. I just switched to Yaz from another pill a few months ago, and so far I'm liking it a lot. All my craziness and chocolate cravings I used to experience in the days leading up to my period are pretty much gone, and my period is much lighter and shorter as well.

Sorry I can't give more input. Good luck with your search!