Is the Ring or NuvaRing effective?

K
My boyfriend and I, decided to use other birth control method beside condoms, because we are now avoiding pregnancy. I have a week using the NuvaRing, and I have never used pills or other method. I haven't had and intercourse since I started to use the ring, and I want to know if it's efective as the pill or other method. 
If you use it, please let me now how you go with it.