I really did intend to use the term "pro-choice", and it is the label I have always used for such a position, if it has to be reduced to a short term. I was just ended up saying "pro-abortion" without really thinking: I suppose I'd prefer the term "pro-legal" or similar...but none of these terms work as stand-alone terms ("pro-choice" only works in that is commonly understood to only refer to this topic ).
Both "pro-life" and "pro-choice" have emotional connotations (especially "pro-life" in my view, but this may be biased)...with "pro-life", you certainly don't get "pro-lifers" with 20 children (whether biological or adopted)...with rare exceptions! ...and you don't get "pro-lifers" living exclusively on roadkill (again, with rare exceptions).