Permissions are not rights . Even if a fetus were developed to the point of surviving as an independent being outside the pregnant woman's womb, it would still not have the right to be inside the woman's womb. According to this view, the source of ones right to life is whether ones parents chose to have consensual sex or not. If this view sounds ludicrous, it sounds that way because it is. Of course not.
Rights are moral principles that guarantee freedom of action in a moral context.
There is no such thing as the freedom to live inside another human being against their will. As it is evil for someone else to dictate the use of her body by raping her, so it is evil for someone else to dictate the use of her body by forcing her to remain pregnant. Murder is the taking of the life of another human being through the initiation of physical force . A right is a moral sanction for freedom of action in a social context. A fetus has no rights, as it does not need freedom to take any actions, but survives on the sustenance of its host.