That said, if you're worried about pregnancy, it doesn't hurt to use a backup method! But when taken correctly, birth control pills should protect you through your entire cycle.
When you are on the pill, the timing is a little different. The 5-7 days of placebo pills are not (usually) enough time for your body to respond to the fall in hormones, shed its lining (have a period) and mature a follicle (egg) before you would start your next pack of pills.
That being said, the pill is 98-99% effective in preventing pregnancy only when taken at the exact time every day all month long every month. The only 100% sure way to prevent pregnancy is to remain abstinent. Otherwise, it is still recommended to use a condom to prevent sexually transmitted infections.
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