I don’t remember any of the Justices Reagan appointed overturning it, do you?
Scalia would vote to overturn and both Bork and Douglas Ginsburg would have voted to overturn.
That doesn't have anything to do with your assertion that Reagan believed Roe was "settled law". He did not and there is clear evidence to the contrary. For example, the following passage from Reagan's Abortion and the Conscience of the Nation.
It is possible that the Supreme Court itself may overturn its abortion rulings. We need only recall that in Brown v. Board of Education the court reversed its own earlier "separate-but-equal" decision. I believe if the Supreme Court took another look at Roe v. Wade, and considered the real issue between the sanctity of life ethic and the quality of life ethic, it would change its mind once again.
As we continue to work to overturn Roe v. Wade, we must also continue to lay the groundwork for a society in which abortion is not the accepted answer to unwanted pregnancy...