The more regularly you take your pill, the more effective your birth control will be. If you keep moving the time you take your pill, the pill’s ideal 99% effectiveness rate decreases significantly. This is true for both combination and progestin-only pills, though progestin-only pills are even more sensitive to irregular dose times. Some methods that help remind people to take their pill on time include: setting an alarm on your phone, using a medication reminder app, and/or combining your pill time with another daily routine that doesn’t change much day to day (like brushing your teeth or making your first cup of coffee).
If you miss a pill, you'll want to make sure you follow the right steps to get your pregnancy prevention back on track. See "What do I do if I miss a pill?" below for more information.