Although I'm pro-choice, one of my pet peeves is when fellow supporters of abortion rights try to pretend that being labelled "pro-abortion" is somehow incorrect. If you describe yourself as pro-choice you are in favor of keeping abortion procedures legal and available. It doesn't mean you love abortions or want to see more of them, but it certainly does mean you are "pro-abortion," as opposed to anti-abortion. It should be obvious, but when you support the right of a woman to choose, the primary thing you support is her right to choose an abortion. That makes you and I pro-abortion. If you pretend otherwise that makes you logically-challenged.
Having said that, why do I use the term pro-choice instead of pro-abortion? I use it for two reasons. First, it's the widely accepted and used term for those supporting abortion rights. Another of my pet peeves is when people refuse to use commonly-accepted terms and instead substitute some sort of jargon preferred by their particular group. (I'll get back to that point shortly.) Second, pro-choice as a term accurately reflects the primary outlook of those supporting abortion rights. Most of us support abortion because we focus on a woman's right to control her own body. In other words, being pro-choice emphasizes that a woman should have the final choice in whether or not she gives birth.
On a related note, I use the term "pro-life" for exactly the same reasons that I employ pro-choice. It's the commonly-accepted and widely-used term for anti-abortion people, and it accurately conveys their emphasis, which is to protect the life of the unborn baby above all other consideration -- such as the wishes & rights of the mother. It is common in left-wing and feminist writings to shun the term pro-life and substitute "anti-choice." I find this incredibly silly. Whenever I see people using this substitution it automatically makes me take them much less seriously.