Teece...I just looked up the Rubella thing because it was bugging me (and I'm second guessing myself about whether I had one or not or if we checked for that prior to TTC).
Here is a link:
http://www.babycenter.com/refcap/9527.html
So, I guess it makes sense. But I really don't know why they didn't give you one there or have you get one at your family practioner, especially if they planned on doing IUI this cycle.