"Or alternatively they could've appealed to the 13th amendment which makes slavery illegal."

You are confusing "legal" with "moral" and "limiting rights" with "slavery."

Equating the abolishment of abortion with "gestational slavery" is the "logical" equivalent of saying that the REAL slavers were the ones who abolished slavery by limiting the "rights" of slaveowners. You can surely see what kinds of absurdities that leads to - reducing the "rights" of murderers, rapists, and pedophiles somehow becomes "slavery."

What you REALLY need to prove is why it is moral to apply the death penalty to innocent humans. (Unless you are going to deny simple science and declare that the human in the womb is somehow not human.)

Good luck making that case!