No one person should decide the taking of human life, no matter how small. The Constitution requires that a jury decides. The woman's life also deserves protection and I will admit that only a victim of rape, has her life taken from her by force.
This does deserve some legal recourse to terminate the impregnation, if the adult victim reports the crime in a timely manner to potentially prevent the assailant from victimizing others and prevents the development of a new life. An adult rape victim does have a social responsibility to report a felony (which I see as a capital offense).
[ I say "conception" is not the beginning of human life. After prophase, the first mitosis (post-anaphase amitosis) is the emergence of a new life with uniquely indentifiable human genetic characteristics. This does not occur immediately and can take up to between 24 and 48 hours. ]
A juvenile is another matter, in that a juvenile is not of consenting age and has no adult responsibilities. This is a murky area as I have said.