Roe was decided by the Burger court, which, according to Wikipedia, "is generally considered to be the last liberal court to date". It was heavily based on a Griswold v. Connecticut precedent by the Warren court, generally agreed to be the most liberal Supreme Court in US history. Both of these verdicts were and continue to be widely criticized by conservatives as being based on extremely dubious reasoning. I don't know what made you think that Roe was "decided by conservatives".
There is a lot historical revisionism involved around these issues, with many people making blatantly false claims, either lying, or being themselves mistaken. The result is that people who have not lived through it, or who have not studied the history diligently, are very much misled as to the facts, because the media, which is very good and active at correcting lies and falsehoods spread by conservatives, takes approximately zero efforts to correct falsehoods spread by liberals (often it in fact acts with clear intent of spreading misapprehensions, by selective reporting and careful omission of facts).