Your doctor will tell which day of your menstrual cycle to insert the first vaginal
ring you use. During the first 7 days of using your first vaginal
ring, you may need to use back-up birth control, such as condoms or a spermicide. Follow your doctor's instructions.
The NuvaRing should be left in place for 3 full weeks. Remove the ring after 3 weeks, on the same day of the week it was inserted at about the same time of day. Allow 1 full week to pass before inserting the new ring.