The Constitution gaurantees these as unalienable rights. "Life, Libery and the Pursuit of Happines".
So it's a question of life. If the woman's life is protected, then, unless the child presents a clear threat to the life of the mother, the unborn child's life must also be protected.
The Constitution gaurantees protection to both.
Just my personal opinion.
That is from the Declaration of Independence, and those rights were secured not by the general governement, but by the 13 colonies themselves. This is why the US Constitution didn't go into this becuase such rights of the people were secured by the people and their States. The US Constitution was simply a compact between the States in forming a more perfect union and left all such manners of rights of the people where the framers considered them to belong: with the people and the States!
I think that is the Declaration of Independance. It is the moral code of the new government. The Constitution was just the rules for operating the government. AND to limit the gov. what ever happened to that????