If they really articulate abortion rights as simply a woman's nearly absolute right to control her own body (as some pro-choice advocates) do, then they should also take the same view as to potentially dangerous surgical procedures.
But the strongest pro-choice arguments -- and, I think, the true views of most pro-choice advocates -- aren't just that a woman has a right to control her own body. Rather, they also focus on the magnitude of the burden that an unwanted pregnancy, and the creation of an unwanted child, imposes on the woman. That's why many pro-choice people aren't also pro-drug-legalization: Snorting cocaine also relates to what you do with your own body, but unwanted abstinence from cocaine is generally seen as a much lesser burden than unwanted pregnancy. Likewise, that one thinks women have a right to avoid an unwanted pregnancy doesn't mean that they have a right to seriously risk their own health for merely cosmetic purposes. (The matter is more complex when the issue isn't just increasing the breast size of healthy but small breasts, but reconstructing breasts after a mastectomy, but I set that aside for now.)
I think that people should be able to completely control their own body, but those of you who are confronted with a pro-abortion person's argument that it is about control over the woman's body, you should ask them how they feel about silocone breast implants or crack cocaine. If they are for any restriction on drugs, you should explain to them that their real argument is that babies are inconvenient.