I think an important thing to note about "a constitutional right to an abortion" is that they just happen to treat this one non-enumerated constitutional right as more protected than every enumerated right. They treated abortion as a right more protected than speech, access to firearms, the right to be secure in your persons, or right to due process.
And then it was supposedly based on a right to medical privacy, but that supposed right was insanely narrow. It only came into existence if and only if you wanted to kill a baby, and the moment you were done killing the baby it magically disappears as if it never happened.