The following is a fragment from aq discussion on emergency contraception (EC) and the “metaphysical” case against it (i.e., that it’s murder).
Many scientists and doctors disagree, claiming that EC can prevent but not terminate a pregnancy. EC works much like birth control pills: Taken in two doses, the drug stops the release of an egg from the ovary, preventing fertilization. In the case of fertilization, EC may prevent a fertilized egg from attaching to the womb. If a woman is already pregnant and an embryo is already implanted in the wall of the uterus, EC will have no effect. [from alternet]