Nuva ring continuous use

Just starting to use birth control for the first time and my doctor recommended Nuvaring. Which I absolutely love. Especially considering the face that he told me there was no medical need for me to have a period. So I can just change it every three weeks and skip my period every month. I was just wondering if anyone else is using this birth control in the same way? 
Also it seems to have stopped my period fairly quickly. I have only been on it for about 3 weeks and I should have had my period a week ago. And I have taken multiple pregnancy tests to ensure that I am not pregnant. 
And help/advice would be greatly appreciated!