This isn’t a question with a binary answer. This is the kind of question you talk about with your doctors, your partner, and people whose moral compass you trust. There’s a lot of factors. For example are we talking about a disability that’s largely survivable or a disability that means they will die as an infant? Do you have the financial and mental means to provide the extra care? Do you already have children? Is the pregnancy expected to be more dangerous than normal? How far along is the fetus?

You can end up on either side of this question and be a good person. This is one of those things that nobody gets to judge you for.