Difficult to know: As long as the condom didn't have a break in it, and it was used for the duration of the sexual activity, you are likely protected. Condoms are over 80% effective. Many other forms of birth control are greater that 95% effective, like iud, nexplanon, depo. Condoms are the only way to prevent std's, so keep using them.
Answered 10/4/2016
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