I am starting my 4th round of Clomid this month, and my doc is giving me 2 more rounds after this, and if it doesn't work, it's onto IUI. I know with the Clomid our chances of twins alone is 1/20 as opposed to the normal 1/100. Does the IUI itself pose a higher risk for multiples more than 2? Or is it just when it is associated with other fertility meds, i.e. hcg shots, etc.