If a fetus isn’t a person, then there’s no victim. The potential of a victim isn’t the same as a victim. The intention for there to be a victim doesn’t even create a victim.
Except this is precisely the opposite of the logic used if some third party causes the harm. If, say, a pregnant woman gets shot in a mugging gone wrong and her fetus dies as a consequence, were more than willing to count that as a homicide and for some reason this line of reasoning vanishes.
It’s either a person or not, not whichever is more convenient to the mother in whatever situation occurs.