As Ingi attempted to explain, the Morning After Pill is not in fact any more of an abortionofenic than normal birth control pills.
Someone said the MAP irritates the lining of the uterus to prevent implantation. Yes it does this, but that is NOT THE PRIMARY FUNCTION. The MAP is SUPPOSED to prevent ovulation first and foremost, just like birth control pills. However, just like birth control pills, the MAP has other effects. Birth control pills thin the lining of the uterus, thicken the mucous plug at the cervix, and can indeed make the uterus a hostile environment for both sperm AND a fertilized egg.
This doesn't happen often, but because the lining of the uterus is so thin, it is possible for the pills to not prevent ovulation, and an egg gets fertilized. Then, it goes into the uterus... but has no where to land. Thus, the birth control pills just aborted a pre-implantation embryo.
THIS IS RARE, just as it is rare for the MAP to cause abortion. It PRIMARILY prevents ovulation.
So if you're going to complain about the MAP, then complain about normal birth control pills too.