I am on my first cycle on Clomid too. 50 mg. This month on CD11 when I had my scan they told me that I had four mature follicles. But since it is only my first month, who knows what will have on the second month. I am 7dpo now, so will be interesting to see what happens. Good luck to you.
I usually get 5 or 6 follies on Clomid. Maybe you need to move on to injectables? IUI's are only about 5% successful with one follicle, and 3 times that with more than one follie. What has your dr. told you?