Pregnant while on Nuvaring?

Hey ladies! I just started my third month on Nuvaring and so far I LOVE it but I've been getting nausea and lots of tender breasts. When I googled it I found a ton of posts about women getting pregnant while on Nuvaring! Just wondering if any of you ladies got pregnant while on Nuvaring or know of anyone that did? Is it really as effective as they say?? Like I said I really love it and would like to keep using it but I don't want another baby right now and the side effects/symptoms keep freaking me out.

I haven't personally, but have also heard stories.