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...but I think it's generally very hard for a pregnant woman to kill another woman without a gunYou are extremely wrong in that thought. One wrong bump on the head, and you are a goner. Don't get in a fight, don't start a fight, and don't stay in a fight you won't finish. Two average-build women fighting is perilous for the participants just like two average-build men fighting.
In the heat of an argument, one or the other is going to get the upper hand, and maybe today they don't choose a good time to stop pounding their opponent's head into the pavement. If you aren't willing to defend yourself, you can only hope that your opponent will show mercy when the time comes; I don't think it is really appropriate to ask the victim of an escalating battery to wait and see if they'll be killed once the situation is completely out of their control.
More details will probably become available, but there are circumstances that can be established, under which the charge discussed makes sense, and under which the person who fired the firearm is not guilty of an offence; such as if the pregnant woman is committing assault in the first or second degree.
> The death statistics of U.S. compared to other countries don't support the theory that guns are used only in mortal danger.
What kind of non-sequitur is that? Nobody is making that claim or any statement that could depend on it.