EC, emergency contraception, also known as “the morning-after pill”, works the same way as the pill, the patch, and the vaginal ring to prevent pregnancy.  Opponents of abortion have suggested that hormonal methods of birth control, including EC, work by terminating a pregnancy.  After a thorough study of scientific medical research, The New York Times found that EC works by preventing ovulation, not preventing the implantation of a fertilized egg.  There is no evidence that EC can harm a woman or a developing baby once pregnancy is underway.  The bottom line is, hormonal methods of birth control do not end a pregnancy, they stop it from getting started.

Read the full article here:  New Research Confirms: EC Prevents-Not Ends-Pregnancy