look, i am anti abortion. i would have no problem doing sonograms in this instance but i respect the right of colleagues to not do them for the same reason i want my colleagues to respect my refusal to prescribe the morning after pill, for example. and patients should have the right to choose a doctor whose beliefs coincide with theirs.
your wife's sonograms were done for the purpose of ensuring a healthy birth, right? surely, you can see the difference in this situation?