The simple answer is, there is no simple answer. Being pro-choice doesn’t mean one necessarily agrees with all of the decisions to abort any more than being pro-legalization means that one necessarily approves of all the decisions people make about where and when to smoke pot. Personally, I’m pro-choice precisely BECAUSE I’m not in a place to be able to make a complicated decision without the information that the mother and doctor have, nor do I have to bear the moral, ethical, economic, or social consequences of those decisions.
Consider a situation where a doctor has good reason to think a child has a low chance of survival (say 10%) and it risks the health of the mother significantly (say, less than 50% if they terminate, but nearly 100% if they do), so they attempt to terminate the pregnancy but the child ends up defying the odds. Given 10% odds, on average 1 in 10 of those kids in that sort of situation will survive. It’s a crappy situation to be in and it sucks if that kid grows up with injuries as a result, but in that situation, if I were the husband or family member charged with making that choice, I’d do the same thing.
And even for the vast majority of pro-choice supporter, I’m sure they could fabricate some situation they’d find morally reprehensible to abort but the child survived anyway, but they’re willing to accept those rare situations to protect it for the much more likely situations that it needs to remain as a real option on the table and having legislation just muddies those decisions even more in what is already likely a difficult situation.
And, really, this is how rights are. It really, really sucks when people misuse their rights and someone gets hurt. For instance, we protect free speech, and it’s one of the most sacred tenants of Western Representative Democracies, but part of that comes with the fact that some assholes are going to use it to spread hatred, racism, falsehoods, etc. Sometimes free speech can lead to some pretty horrible things, like bringing together hate groups, unintentionally (or maybe not so unintentionally) leading to violence. I will absolutely express my sympathy to people who have had to deal with hate and it’s consequences, but if their response is to argue that we need to put limits of free speech, even understanding their pain, I just cannot agree with that conclusion.
Abortion survival stories are fundamentally an appeal to emotion. Yes, abortions sometimes lead to injuries to child and/or mother. Sometimes, even when all medically goes well, it can have long term emotional, social, or economic consequences leading to serious depression, fracture families, etc. But, as with all rights, it comes with an onus to use it responsibly, carefully thinking over whether that’s really the right decision for a given situation, and the ownership of whatever consequences, foreseen or not, may result. So, yeah, it sucks that sometimes it leads to suffering, and it’s impossible to have an objective law, so we have to trust people to use their own moral judgment.