I would wait. The reason being that if you need to go again with a stim (and I really hope you don't!) then you will have to pay the threshold amount again in the new year. Better to try to keep all treatment in one calendar year.
You know what....I didn't think of that! Doh!

We are going to play it by ear.... that is I will put in my script and get the drugs then wait for my period to turn up. If it looks like it's too close to Christmas I'll wait until after. Thanks!