Provigil can affect Nuvaring I would prefer not to change my BC but am not sure if I am protected against pregnancy. How do I know if my BC is working?

Package insert. According to the package insert on Provigil it increases the metabolism of the Estrogen component of contraceptives. The Nuvaring package insert also reports this. A Nonestrogen containing birth control method such as Nexplanon, Mirena, (levonorgestrel) Skyla and Paragard may be a better choice for you.