Plan B is an emergency contraceptive that can be taken up to 3 days following unprotected sex, or contraceptive failure—broken condom or missing a day of oral birth control. Plan B is an over the counter oral medication available for delivery so you can keep a dose on hand. Wisp can prescribe Plan B emergency contraception before you need it and ship to your home for FREE (just in case). Levonorgestrel 1.5 mg.