NuvaRing and welbutrin xl

I have been using the Nuvaring for the past couple of years. While it's a greatly effective form of birth control & I love the convenience I have recently started to realize that some of the problems I've been having may be side effects of it though. My sex drive dropped to almost nothing shortly after going on the nuvaring...I thought it was just my life (twins born 13 weeks early and were about a year old at the time and I was in college full time). Then the depression started getting worse & worse. I've been on and off several anti-depressants in the past year or two and they help, but don't help the sex drive problem. My husband & I have decided to try for another baby, so I'm stopping the nuvaring this month as well as the welbutrin xl and am hoping that I will see an improvement in both sex drive and the depression. I had no idea that these problems could be related to the nuvaring. None of the Drs I've seen mentioned it as a possible cause for these issues.