That's great you have a plan to go forward there Luv!!!
You never know your luck, you might get lucky with the IUI. It has happened to one of the Girls here on the thread. Frankly, the chances of multiples in your age group are really low so I'd think of it as doubling my chances if you've got a couple of follicles that look like they might be going to ovulate at the time you're going to be inseminated!!
Let us know when you get started on the Clomid too!!