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If a woman already is pregnant, the Plan B pill has no effect. It prevents ovulation or fertilization of an egg, and according to the medical definition, pregnancy doesn't begin until a fertilized egg implants itself into the wall of the uterus....

liar liar pants on fire

If a woman has not ovulated, the morning B pill will stop ovulation. That is why we use it if we see a woman within hours after a rape. But if you give it later, it will stop the fertilized egg from implanting in the uterus, and if she is a few days pregnant, it will starve the growing fetus (actually at this stage an embryo) and cause an early abortion.

As for "medical definition": Actually until a few years ago, a pregnancy started with fertilization. The pro aborts in the OB GYN societies "changed" the definition, partly so that the 100 thousand fertilized eggs/early embryos sitting in fridges because they were left over from IVF ('test tube babies') wouldn't be called pregnancies...