You can start your pills at any time, however when you start can determine how soon you are protected against pregnancy. If you are taking a combination pill (progestin and estrogen) and you start your pills within 5 days after the start of your period, you are protected against pregnancy immediately. If you start the pill any other time during your cycle, it takes 7 days of taking the pill to be protected against pregnancy, so make sure to use a back-up method like condoms. If you are taking a progestin only pill, you can start that pill at any time, and protection will begin 2 days after you start taking the pill, so make sure to use a back-up method during those first 48 hours! Please call us if you have any other questions about birth control, or when you should start your pill at 1-877-275-6123.