if we are to assume that abortion is immoral, then is it also immoral to become pregnant when miscarriage is a near certainty?
I think it depends on what premises you base the ethic that abortion is immoral.
For example, if it is based on the tenet "Leave it to Nature", then abortion is immoral, because you're interfering what is happening naturally, but trying to conceive when you're likely to have a miscarriage is not immoral - "If that is what Nature wills, then so be it" - you're only trying, since you're not completely sure, there's a chance, however small it be, that you will conceive.
That's only an example.
So you should probably find out what your friend's premises. If it's religious, then it might even be immoral to not try to conceive, depending on what his religion says about the subject. In fact, if he is religious, then this question is probably easily answered - all you have to do is see what the religious text has to say about it. Whatever it says would be, or ought to be, his moral principle.
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