Not zero: If the condom breaks, it is as if no condom was used. Some semen can leak before a man has an orgasm. This is why early withdrawal doesn't always work. By 4 weeks after your last period you should be able to do a urine pregnancy test. Read the instructions to be sure when to do the test. Not all tests are equal so look at more than one test.
Answered 5/5/2015
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