*nuvaring is an estrogen/progestin combination hormonal contraceptive (chc) indicated for use by women to prevent pregnancy. *nuvaring is a small, flexible vaginal ring containing 11.7 mg etonogestrel and 2.7 mg ethinyl estradiol, which releases on average 0.12 mg/day of etonogestrel and 0.015 mg/day of ethinyl estradiol. *you put it in for 3 weeks, take it out, then put a new one in a week later.