The morning-after pill and intra-uterine devices abort embryos. An embryo is the result of the fusion of the nuclei of an egg and a sperm. The presence of an embryo that is potentially capable of implantation means that conception has already taken place. There is some lack of clarity of thinking here from anti-abortionists (as ever). You can't have it both ways. In essence, what we refer to abortion is no different from what the morning-after pill or the coil does. Make your minds up about exactly what it is you're for or against.