http://en.wikipedia.org/wiki/Roe_v._Wade
maybe im missing something, but the first three paragraphs explain a lot. abortion was illegal.
If you are a doctor, and dont want to perform abortions (for whatever reasons) then dont. The law allows the freedom to perform them, when there was no such freedom before.
At the time they were. You are mistaking that for the effect of a challenge to the doctrine that would have the legal effect of overturning that decision.