I don't think it's necessary. Abortion is disconnecting the fetus from the mother - that's definitely related to the bodily autonomy of the mother, regardless of whether the fetus itself is considered part of it or not.
I myself am not sure if I consider the fetus a part of the mother or not. There definitely is a point when it is no longer a part of the mother and I don't think it's only at birth. But regardless of the exact transition point, the mother has the right to decide what is connected to her body.