Yes! I was part of an infertility support group, and one of our members had triplets from an IUI. It made me very cognizant of the risks. But I know plenty of women who ended up with singletons from IUI.
I did 6 IUIs and never got pregnant...had to resort to IVF for a successful pregnancy (PCOS diagnosis), but I know plenty of women for whom IUI was successful. The key to reducing the risk of multiples is making sure you are very carefully monitored. I always cringe when I see women who post on this board about unmonitored IUU or TI. Roulette.

I know the risks of multiples for a medicated IUI is around 10% per cycle and it's really stressing me out. I don't know what might make me feel better about this, I guess I just want to know if anyone else has anxiety around this issue!