I realize I'm not arguing with your opinion here, but only with your frame of mind. Anyway...
It's a valid, if not an old, point that your priest made to you. It's not a reason for a choice though, but a choice with consequent reasoning. Okay, maybe that doesn't make sense but..
Any time you make a moral decision for someone else, which you should never do anyway, you have to take into account facts, and there are only 2 relevent facts in this issue.
1. making abortion illegal does not decrease the number of abortions, only the number of safe abortions.
2. every person with any insight into when what we call life really begins (doctors) practically unanimously believe it is not until after the first trimester at the very earliest.
If, and only if, you were to accept the Catholic ideology in the arguement of life, then you are not arguing for actual life, but the potential for it. By that arguement, (it's crude, sorry) thousands of abortions are being performed by no fault or our own every time someone ejaculates, whether 1 pregnancy is a result of that or not. I know, it's almost a cliche at this point, but true none the less.
And if you do accept it's all god's design, than he designed it such.
I'm not going to attempt to remove that cross you've chosen to burden yourself with (catholisism.) I would though suggest that with some points at least, you should be the one advising the priests, and not the other way around. After all, of the two of you, who could even bare a child from that act?
I don't have any opinion on abortion unless I know it's my kid. I would distrust any male who claims otherwise, agent of god or not.