No they weren't.
To quote the Dred Scott case
A person has rights you have to respect, Negroes did not have that and therefore were not people.
At least that's how people at the time viewed it . . .
And in the future people will justly condemn our view of fetuses as not people just as we condemn those who viewed blacks as not people.
You have no idea what the future will bring. However you did cement the case that if the law says a fetus isn't human then it isn't human, just as blacks weren't people. You might want to pick a better argument for your case.
A fetus has to be a human if it's that of a pregnant woman. The problem comes with the incompatibly of absolute rights. A woman has an absolute right to determine if she wants to carry a fetus and if she does only then does it's right to life pertain. You can't have the theoretical absolute right of a fetus violate the actual right of a women to determine the fate of her body. Those who are right to life are pro violence to women. This is why all sensible people seek some rational accommodation between these two fundamentals.