Day 9 is fairly early for monitoring, and so I think those numbers sound good. Follies can grow 1-3 mm a day, and you want them to be at least 18 mm for IUI. So it sounds like you're reasonably on track for that. Follicle growth also isn't totally linear, so you could end up with 2 or 3 mature follies for trigger. That's pretty normal/average for a medicated cycle...so I think you are good.
Just FYI, CM is usually used as an acronym for cervical mucus in TTC circles, so you may be confusing people at bit when referring to monitoring. :) Most people just call it monitoring.