The birth control pill prevents ovulation. There is no conception because there is no ovulation. The birth control pill is NOT abortion.
The morning after pill prevents a fertilized egg from implanting. It destroys a new life, AFTER conception. It, like RU486, is an agent of abortion.
This is not what I have been told and I am not sure it is accurate. Based upon previous discussion on this thread it seems that: the birth control pill does prevent ovulation in most cases. However, in some cases, (3-5% per another poster on this thread) the egg is released and fertilized. The fertilized egg cannot attach to the uterus because of the birth control pill, which is an early abortion. Same for the morning after pill. It works to prevent ovulation as well, but like the birth control pill it can prevent a fertilized egg from attaching. I will try to find some more scientific evidence and I will post it but this seems to be the consensus so far.
What about the changes in the uterine wall to prevent implantation? I think different pill formulas act differently, do they not?
I'm taking advantage of your medical training here, feel free to tell me you're a heart surgeon and have no idea!