"i watson nuvaring for 1 year 2 months and now i am writing this review because i am currently in a hospital with blood clots in my lungs. i won&#039;t know if the nuvaring is the definitely blame for this until tomorrow but its most likely. as far as preventing pregnancy, the product works well. as far ad comfort, i give it a 9. unfortunately, this is one if the risks that occurs with taking any birth control. so i want to say be careful. any changes in your body, please report them to you obgyn. i had chest pain and thought i pulled a muscle. thank goodness i followed my instincts and went to the er. these blood clots could of traveled to my heart."