What does the NuvaRing stop ovulation?

The NuvaRing prevents ovulation by releasing a combination of estrogen and progestin hormones into the bloodstream. These hormones work by inhibiting the body's natural hormonal signals that trigger the release of an egg from the ovaries. Additionally, the hormones thicken cervical mucus, making it more difficult for sperm to enter the uterus, and alter the uterine lining to reduce the likelihood of implantation. Together, these mechanisms effectively reduce the chance of pregnancy.