Being pro-life is utterly untenable and stupid.
It is neither.
The question is when 'life' begins. This is the question the SCOTUS had to deal with in Roe v Wade. At this point in time, it is more of a philosophical question as opposed to a scientific one. The SCOTUS is expert in neither but did the best they could with what they had at that time. It's hard to argue (reasonably) that their decision wasn't somewhat arbitrary if only because no one knows the answer. Many have opinions, but no one definitively knows. Moreover, science has advanced much since the ruling. Will they go back and revisit their decision, basing it upon newer/better science? If not, why not?
The vast majority agree that it is wrong to take innocent life, so let's brush aside this rubbish about "a life of suffering". There are plenty of people suffering in this world, we do not go around 'putting them out of their misery' like some stray animal at the pound.
And there are more than the choices you present: abortion or a life of misery. If the mother kept the child it may well work out not to be a life of misery. And adoption is neither mythical or difficult. I have known a number of people who were adopted at birth and not one thought of their life as one of misery. I have also known several couples who were unable to have their children and adopted. It is difficult because there are very few babies available for adoption. All but of the couples had to go outside of the USA at great expense to adopt a baby.
But my point here is that is that since we don't know when life begins, my conservative instincts tell me the right thing to do is err on the side of caution. If I'm not sure I'm not killing life I wouldn't do it. Maybe some day science will have better answers, but until they do I think we should be careful.
Fern