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If you forget to take a pill one day, you can take two the next day. If you forget to take 2 pills in a row. you can take two pills the next day and 2 pills the day after that. If you forget to take 3 pills in a row, you can simply finish the pack, but you are not protected in that month. You should be sure to use a barrier method of birth control for the rest of that month.
If you find that you have forgotten to take pills on several different occasions. the birth control pill might not be the best method for you. You can consider the patch or the ring. Neither require you to remember birth control every day.