I just spent 8 days in the hospital (2 days in ICU) with multiple PEs (blood clots in my lungs) thanks to the NuvaRing. I had used it for 11 weeks and had symptoms of the blood clots for 6 weeks. My doctor was originally treating me for asthma because of my chest tightness and extreme shortness of breath. I do not smoke and am in great health otherwise. The ER physician instructed me to take the ring out immediately as I was being transported to ICU. Every MD that I saw at the hospital pointed to the Nuva Ring as the culprit. This thing is dangerous...don't ignore the symptoms!!!