Hi Lisa,
I just finished my first cycle with Follistim, and on the day of my trigger shot I had one mature follicle at 18. However, I was monitored every other day with blood work and u/s so they knew how I was progressing and could adjust the dosage. The day before my trigger shot I had about 20 follicles total with a handful that were 13. At first they wanted me to lower my dosage for two nights, then do a trigger shot. With further discussion they decided to have me come in the very next day to see how I responded in the day. By then I had an 18 so they decided to do the trigger shot that night instead, and IUI 36 hours later. Oh, and in total I only took the Follistim 6 days.
Did they monitor you closely? It sounds like you had lots and lots of follicles which is good, but maybe your dosage should have been lowered at some point so you didn't have to cancel the cycle of IUI.
Hope you've been doing lots of BMS! Who knows, maybe this will do the trick.
Smiles,
Amy