Thank you for your question. Plan B is about 95% effective if taken within 24 hours of unprotected sexual intercourse. We are not sure when she took this emergency contraceptive medication, and the efficacy of it decreases it is taken beyond 24 hours of sexual intercourse. Even though you did not ejaculate, pre-ejaculatory fluid does contain sperm and the potential to cause pregnancy. Therefore, if your partner has missed her period, we recommend that she see her doctor to conduct a pregnancy test to be certain.
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