That's an arbitrary designation that suits your purpose but reality says at conception a specific human being has come into existence.Until it is able to live and breathe on it's own, it is not a "person", and while we may mourn the babies that never were, it's something that women are taught to accept. We have to. We're told not to get too excited, not to tell people, until the first trimester is past.
We don't name them, and we're not allowed to mourn them if they don't make it. But if for some reason, we cannot carry these little ones to term, we're "murders". God gave women free will, and the ability to stop a pregnancy that is ill-timed. In times of famine, or war, or disease, we can stop the pregnancy, and wait for a better time, because raising small humans is a huge life-long commitment and in fairness to your children, one you should be in the best place possible to undertake.