We strive to save all those we are able. There is still the big difference between allowing a human to die because you can't do anything (miscarriage) versus outright killing an innocent human (abortion). There is nothing that can be done for those who die as a result of miscarriage - and many women do mourn the loss of their children when they realize they've miscarried.
Just because you "DON'T THINK" (about much of anything) it doesn't make it true. I believe in life, from conception to natural death, and I work to support the poor throughout their lives through my charity - another area conservatives put liberals to shame.