Am I wrong for being upset that my fiance asked his mother to make wedding favors without talking with me 1st?

My fiance and I have been engaged for about a year now for an August 2011 wedding. From the very beginning we decided to make a donation in lieu of wedding favors. Well, the other day when we were at his parents house, his mom was talking about the favors she made for his sisters wedding (which I seen, and were completely NOT my taste) so my fiance took it upon himself to say "Mom, why don't you just make our favors?" which she was ecstatic about...and I am standing there speechless and confused. What am I supposed to do? Shouldn't he have spoken with me about this first? We can't go back now, it would break her heart...and it would obviously be because of me! To him it may just be a favor... to me it is a piece of the decor that I have worked months on envisioning! :( Advice please.