It's all about faith. You can put your trust in a worldly doctor, or you could invest all your faith in the Doctor of all doctors like the example I gave earlier.
The "what ifs" are endless. What if I follow the worldly doctor's advice and get an abortion? I can get it done to save my own life, but what if I meet my death the very next day? We can temporarily take life and death into our own hands, but we don't know if we're going to even get another breath, so what good is it?
If I put my faith in the Doctor of all doctors, I would juggle with neither my life, nor that of my unborn child. I would let Guru Sahib take whichever life he needs to take rather than thinking I'm wise enough to make that decision on my own.
Essentially, once we allow exceptions under X and Y circumstances, how can we condemn those who get abortions because they don't want a girl-child, or if they find out their child will be handicapped? We can't play the role of God, ever. We are neither wise enough nor far-sighted enough. We see only the benefit/cost of our decisions in the here and now, but Guru Sahib sees our past, present and writes our future accordingly.