Well, there's the rub. It's a matter of language, really. To some people, the word "abortion" implies an intention to kill the child. So, in the case of ectopic pregnancy, it is better, IMO, not to call the surgery an abortion, because it isn't one.
Being one of those nasty Catholic extremists myself, it helps me to use precise language. We say procured abortion is always gravely wrong, but in so doing, we do not mean that a surgery of the type you describe would be wrong.
I would point out, though, that many people that hold to this position really are sincere about it, and don't take the position just to beat up on you, or on women generally. We really think that a procured abortion is the taking of a human life, and is therefore immoral. At the same time, we understand that many women, for various reasons, and not always with sufficient information, have had abortions, and they are suffering emotionally as a result. That's why there are many programs, like Project Rachael set up to help them.