>>>In every case we know that fertilization has not taken place?>>>
This pill does not END a pregancy, it is not designed for that. It PREVENTS the egg from attaching (if I'm understanding it correctly). No different in my mind than birth control pills that prevent the egg from releasing.
There is plenty of evidence that the pill does end preganancy. Why do you think it is so highly effective? It not only suppresses ovulation, but it can change the uterine lining and prevent implantation in certain cases.