Before choosing birth control, you may want to compare how well each option works. Some birth control options prevent pregnancy better than others.
Comparing birth control options
How well each birth control option works is given as a percentage. The closer the percentage is to 100%, the better that option works to prevent pregnancy. This is during the first year of typical use. Using no birth control works about 15% of the time.
Comparing emergency contraception
Emergency contraception is a backup method to birth control. You can use it if you didn't use birth control or your birth control method failed. There are two types. They are IUDs and pills. How well each works is given as a percentage. The closer the percentage is to 100%, the better that option works to prevent pregnancy.
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