A fetus does not have a right to be in the womb of any woman, but is there by her permission. This permission may be revoked by the woman at any time, because her womb is part of her body.
Permissions are not rights. There is no such thing as the right to live inside the body of another, i.e. there is no right to enslave.
Contrary to the opinion of anti-abortion activists (falsely called “pro-lifers” as they are against the right to life of the actual human being involved) a woman is not a breeding pig owned by the state (or church).
Even if a fetus were developed to the point of surviving as an independent being outside the pregnant woman’s womb, the fetus would still not have the right to be inside the woman’s womb.
What applies to a fetus, also applies to a physically dependent adult. If an adult—say a medical welfare recipient—must survive by being connected to someone else, they may only do so by the voluntary permission of the person they must be connected to.
There is no such thing as the right to live by the efforts of someone else, i.e., there is no such thing as the right to enslave.