IUI twins

Hi I was told there is a high chance of twins then normal when you do a iui while on fertility med. I conceived by iui while on 150mg of Clomid and I already ovulated on my own but my Dr still put me on Clomid witch is fine. I actually hope there is two babies but first ultrasound isn't till next Monday. So my question is has any of you got pregnant with twins after iui and a fertility medication? Also I used a clear blue ovulation to detect when u was ovulating for the iui and it went from low to peak the next day it skipped over high. Witch I thought was a little weird. But any who I would like to head your storys. I am 7 weeks 5days.