Yes, if a woman choose not to get an abortion in the first half of her pregnancy, we then need to respect the rights of the fetus. That's about as fair if a balance (slanted toward the woman's rights) as possible. And she'd only be obligated to carry the baby until it can be safely delivered, not necessarily to full term.

In short, for the first half of the pregnancy, she has complete freedom to choose. For the second half, the fetus gets protection. That seems fair.