I'm pro-choice,
Fetuses, for the vast majority of the gestation period have the sentience and self-awareness of slime mold. Maybe, if science could say "Hey, here's the point at which the baby's brain starts firing and forming structures identifiable as a human brain." then after that point, an abortion might become illegal. Fetuses more resemble chickens than babies.
If someone says "Then don't get pregnant in the first place" They don't understand the pressures placed on both girls and boys to have sex. It's seen as a rite of passage for many men and boys; and for girls, as a form of communication and a show of love. Sex is MUCH more than just reproduction, it's practically a form of entertainment for some.
Then, a lot of people who get pregnant and want abortions is because it's economically unviable for them to rear a child. Men can run, and quite often will, and it's easy enough to avoid paying child support. which leads a woman stranded with this kid. If the law stated that an abortion is illegal if the man doesn't consent to it, then many women might be stuck trying to track down someone who ran. this could open windows to entire multitudes of problems and economic harassment, economic rape, which I wouldn't put past some people.
Illegalizing abortion, and forcing the children to be put in foster care would put enormous amounts of strain on an already defunct system. And many children who go to foster care lead miserable lives.
Then, there's just the fact that making abortion illegal is not the place for law, laws are supposed to protect the rights and freedoms of humans, (And, in the case of animal cruelty laws, animals that have been proven to be somewhat intelligent and self-aware. not slime molds. And limiting the freedoms women for something so enormous as having something that you'll probably have to rear and live with for the next eighteen years, and could very well place an economic, career and livelihood damper for the next eighteen years, is not the place of law.
And who the hell gives a damn about natural or unnatural things? Lots of horrible things happen in nature, infant and juvenile animals die all the time, and nature doesn't care. Many beetles are rapists as the primary form of reproduction. Most unnatural things are in place because, undeniably NATURE DOESN'T GIVE TWO SHITS. And if nature doesn't care, and it's to our benefit to do something unnatural, then do the unnatural thing.