There is no slippery slope. It is really very simple and straightforward. Your state can assert its interest when the fetus is viable. Just not before. A pre-viable fetus is solely the responsibility of the mother. That's the line of demarcation between the woman's liberty interest and the State's interest (should it choose to assert it) in protecting the fetus.
Sorry to put the burden on you, but before the State can assert its interest, you can still try to persuade the woman to do the right thing. Why not try, and let the Constitution protect the woman's liberty?
You bring your college egghead professorship to the argument, think this is progressive thought but the ruse is over, all you are standing for is slaughtering people of color. Same ol' Democrat party of the 1860s and they want off the plantation.
Definitely a culture war, if we go down, as they say, this is a hill to die on. Nobody said it'd be easy.