By definition, a fetus does not possess rights because the things in nature that give rise to rights are human individuation and the faculty of volition, which in turn gives rise to moral agency.
A fetus is the diametric opposite of individuated: it lives off of a fully individuated host. For this precise reason, the right belongs exclusively to the host — i.e. the pregnant woman — from whom that fetus derives its life entire. When the fetus is born, it becomes individuated. It is at this point that rights begin.
There are no such things as fetal rights — just as there are no such things a zygotic rights or cytoplasmic rights or protoplasmic rights.
On this issue, as on many others, I stand in complete disagreement with so-called libertarians (a meaningless word), many of whom are far to the left and many of whom are far to the right. I am, for the record, a classical liberal. And here’s one thing I’d like for someone to explain to me at last:
How does it follow that because a woman does possess the inalienable right to choose abortion or not, I or anyone else should therefore be forced to fund the abortions of others, as Barack Obama and the leftwingers are now demanding?
Answer: it does not. It does not follow.
This is a non-sequitur fallacy writ large.
My rights, your rights, everyone’s rights stop where another’s begin.