2nd IUI attempt...

Hi Dr. As you probably already read, my 2nd IUI was a bust and it didn't work. I am 28 years old and everything is fine with me after all of the tests that I have done. I was wondering what your thoughts abotu this are. My doctor says that more than likely the 3rd and 4th attempt at the IUI are more promising then the first and second times. IS this what you also think? Your thoughts about this would be greatly appreciated. Thank you!