Quite interesting that this is so focused on abortion only. True, abortion rights are a big part of being pro-choice, but it's still only a part.
Debate the semantics as much as you like. If you want to boil down what being pro-choice is about then the easiest answer is:
Being pro-choice means that a person supports the right of women to have control over their own bodies, lives, careers, educational potential, and intimate relationships without fear of being controlled by others.
Forcing a woman to have (or not have) a child has an impact on everything mentioned above. Legislation to control abortions is just the beginning of a larger agenda. If the radicals in power would have all that they wanted, women would no longer have access birth control, would see radical cuts in funding for medical research for "women's health" problems (ironically enough, including research into infertility), and would probably see insurance companies cease coverage for most, if not all, women's health concerns.
Calling pregnancy an "inconvenience" marginalizes the issue - for both sides. Choosing to have an abortion is not an easy decision to make. Claiming that adoption is always an option is inaccurate as well - not only for women with health or drug problems, but also for perfectly healthy ones. Potential adoptive parents don't want the headache of worrying whether or not a mother (or father) will come around to reclaim the child, which is probably why foreign adoptions are rather popular. Pregnancy remains an excuse for inequities in the workplace, with women still making less than men for the same jobs, presumably because women can end up leaving the workforce at any time due to maternity leave.
I could say much more, and definitely will on the main site here...