Just because pregnancy is a possibility of sex does not mean it is a choice. By that logic, getting an STD is a “choice” because its a possibility of sex too, even if the other person lied about having one, broke the condom, etc.
If you chose to stay out in the sun all day without sunscreen, isn't it fair to say that you chose to get a suntan? In both cases, it's a direct, foreseeable, obvious, and common consequence of the action that was a choice.