If the condom broke, then you have 72 hours to obtain emergency contraception, which will help to keep you from becoming pregnant. You can obtain emergency contraception at a sexual health clinic, at the emergency room, or any number of places. For more about what to do, see our article on emergency contraception.
If you choose not to get emergency contraception, you can take a pregnancy test as soon as you've missed your period, or 10 to 14 days after this incident occurred.
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