Nuvaring is a vaginal ring used to prevent pregnancy. Nuvaring works by containing the hormones etonogestrel and ethinyl estradiol which prevent a woman's egg from developing every month. Nuvaring is used by women as a birth control option. It can be described as a small, flexible contraceptive ring that is the size of a dollar. This ring has the same hormones that you will find in most birth control pills. A woman is supposed to insert it into her vagina for 3 weeks. This duration will see it releasing a steady, low dose of hormones. The woman can remove the ring for 1 week during the time she will be having her periods. When used correctly, Nuvaring prevents almost all the pregnancies. Its efficiency is between 98%-99% meaning that out of 100 people, only 1-2 women who use it will get pregnant by accident.