Perú defiende la vida

How
does Plan B work?

Plan B acts primarily by stopping the release of an egg
from the ovary (ovulation). It may prevent the union of sperm and egg (fertilization).
If fertilization does occur, Plan B may prevent a fertilized
egg from attaching to the womb (implantation). If a fertilized
egg is implanted prior to taking Plan B, Plan B will not work.

...pero no solamente lo dice la
FDA....sino lea esto.