I went in for my follicle check this morning, and the news is good. I have one on my left ovary that is 17 mm, and three others on the right that are 13-14 mm. Of course there are lots of little follicles too, but it's the big guys (girls?) that matter.
I'll do another 50 IU of Follistim tonight, to keep them growing. They are guessing that I will trigger tomorrow and IUI on Friday. Fingers crossed!