1) Does being pregnant increase mortality rsik at all?
2) Is it pro-life to force a female impregnated by rape to carry the baby to term?
3) Are the rights of the female of zero consequence to you? ... Please note, she is an innocent also, being put at risk by the crime committed against her, so she does have self-defense rights where she has been forced into risk she did not ask for.
I'm sorry that your effort to present this as ONLY an either or with your carefully crafted either and or is not sufficient to define the real issues, but there it is.
Until the entirety of the complexity is addressed--since the self-defense parameter is real and has merit--there will not arise a meaningful end to this assault on the alive unborn because it is incorrect--a false trail--to address only the rights of the alive innocent unborn. But remember, this effort must be focused upon the earliest age of the newly conceived for dealing with the rights of the impregnated innocent. Courts call these 'compelling interests'.
The mortality risk was forced upon her by the rapist, not the baby. Thus, the baby cannot be held accountable for the actions of the rapist.
But if you hold a "pro-life" position, you should really check your argument anew. For if the baby CAN, in principle, be held to account for the risk not of his or her own making, then whether the baby comes as a consequence of rape or incest is not important to determine if the baby can be killed at the whim of the mother whose mortality rate has increased.
The mortality rate of the mother only marginally increases anyway. Abortion results in close to 100% mortality rate for the baby -- and has other detrimental effects on the mother. Therefore, even by that standard, justice demands that the risk effected by the pregnancy on the mother does not warrant the ultimate response against the innocent baby, as you suggest.