Family Planning Plus

If the condom did not break and if he withdrew his penis prior to ejaculation, we would not even have recommended use of Plan B.  It is highly unlikely that a pregnancy could have resulted from the situation you described.  However, there is always a chance when two people engage in intercourse even when using multiple methods (for example, the condom could have been defective, the pre-ejaculate could have contained sperm, and you may have ovulated before Plan B use).  However, the chance of all three of these things occurring simultaneously is very, very slim.