In a situation like the one you described, no one's opinion matters except the mother's. Different women will choose differently. Personally, I would choose to terminate the pregnancy if my life was in danger, even if it was viable. I have two little girls to raise. I'm not leaving them behind because of some romantic idea that an unborn fetus's heartbeat is more precious than my own life. I would be sad, and I would grieve, but I would be grateful that I was able to make the choice to save my life, so I could raise my kids. This is why abortion should be legal, safe, affordable, and considered a normal part of women's healthcare. Anything less suggests that women aren't capable of making decisions about their lives and their health.