Okay...I know what Natural Family Planning entails, but can you not see even a little contradiction in your above statement? Also, I agree that most all birth control pills have a back up abortifacient effect and the IUD does it as its main function and I am against these for that reason.
From our POV ABC involves the use of drugs or devices to impede or stop a healthful and natural process. NFP works with the natural process.
I have a friend who was using (insert menacing music here) "the Pill" and got pregnant anyway BECAUSE she was taking ampicillin. Who knew? Anyway, her husband and she called the fetus "Ampicillin" ("Ampy" for short) for the duration of the pregnancy. Somehow to me this highlights the bizarre nature of using a 'medicine' to prevent a benign natural process.
(But then I think Botox is perverse too.)