The controversial case Roe v. Wade in 1973 firmly established the right to privacy as fundamental and required that any governmental infringement of that right to be justified by a compelling state interest. In Roe, the court ruled that the state's compelling interest in preventing abortion and protecting the life of the mother outweighs a mother's personal autonomy only after viability. Before viability, the mother's right to privacy limits state interference due to the lack of a compelling state interest.
I assume that we are barking up the abortion tree here, trying to get at the right to an abortion that is based on the right to privacy. First, Roe v Wade declared that right to privacy as fundamental, even though there is no reference to the right to privacy in the US Constitution. But is it? Is that something that 9 unelected people should decide, or should it be codified into law by Congress? There is no stare decisis here where prior law dictates that position, and therefore the 1973 SC had no legal basis to make that right as a fundamental one.
That being so, their decision that the state's compelling interest in preventing abortion and protecting the life of the mother outweighs a mother's personal autonomy only after viability is open to question. They had no legal basis to make that call; the decision concerning what outweighs what was not theirs to make; they in effect legislated law from the bench, which they do not have the authority to do. It should not be up to them to decide what outweighs what, that should be up to the Congress or the states to consider. Who are they to decide that viability should be the only determinate? Even if the right to privacy is fundamental, they have nothing to base the determination for when an abortion should be legal and when it shouldn't. That is not their call to make.
"Before viability, the mother's right to privacy limits state interference due to the lack of a compelling state interest." Based on what law or prior ruling did they decide this? I don't believe there is one, they made it up out of thin air. Which is not within their purview; really, that decision ought to be up to the states to determine what their compelling state interest are, in the absence of any federal law.