Ethinyl estradiol / etonogestrel
"Bilateral Pulmonary Emboli directly due to Nuvaring use. 
Misdiagnosed by first couple physicians and sent directly to ER after another physician recognized the signs of a potential blood clot. I was extremely active, had a great career, and never thought something like this would happen to me. I really liked the Nuvaring for a variety of reasons, but nothing is worth dying for. This came very close to killing me and I had to make big changes to my life after my blood clots. Weigh Risks and Benefits with more than 1 physician, and look for alternatives!!!"