I got BFP on 4th IUI with my ds 3 years ago and BFP on my 3rd IUI 13 weeks ago! Good Luck.
My dr. always told me that IUIs give you 15-20% chance of pregnancy, which is actually really close to that of healthy couples having when trying to conceive naturally. IVF bumps your chances to 50-60%. Best of luck :)
My RE gave me only a 6% chance. I can't remember what that was based on tho - age? I did 2 IUI's and they both failed. the first one i had 4 follicles and the 2nd one i had 2 BUT I also read that the average amount of times to get it to work is about 4 and sometimes it takes as much as 6 times. good luck and stay positive!!
Most studies show 20-26% success rates with the highest being between the 3rd and 6th attempt. Also US studies say three follicles gives you the best chances where European studies says 4.
I just got my positive Beta today after IUI. Good luck