Cookie - I'm sorry you're having issues with your doctors, I understand your frustration.
My regular OBG wouldn't allow me to take Clomid without being monitored, she referred me to a fertility clinic instead. I believe she had the same concerns it seems your doctors are expressing - the possibility for multiples. The fertility doctors I worked with put me on 5 days of 50mg Clomid, then Bravelle injections, eventually followed by a 'trigger' shot to induce ovulation. I was monitored every 2 - 5 days by ultrasound once I began taking Clomid to determine how many eggs were growing and would be potentially viable. The fertility doctors were careful to set the dosing so my body would mature 1 possibly 2 eggs at the time of IUI; It seemed to me that this was a bit of a guessing game on the doctors end because they don't always know how your body will respond to the medication and with each attempt the medication regiment was different. HOWEVER - before the IUI my doctors and I knew how many eggs were viable and my odds of having multiples (we never attempted and IUI with greater than 1 egg). If you get to the end of ferility treatments and there are 2 eggs, I always had the option not to proceed with the IUI and wait of the next cycle. Because of this I felt very comfortable. I'm not sure if this helps you know how to approach your doctors on this subject, it seems to me if you are going to a clinic that is closely monitoring their patients, the concern for multiples is greatly reduced.
Good luck Cookie! And thanks to everyone else for the congrats!!