Hi there! First of all, good luck! With my first DD, I had one IUI the day after the positive OPK. My temp started to rise the day of the IUI as well, looking back at the temp chart. I am currently pg with #2, due end of March/Early April and with this one, I had a positive opk on a Sunday (my dr doesn't do IUI's on Sundays anyway) so I went in on Monday afternoon for an IUI and a second on Tuesday morning. Of course, I have no idea which IUI did the trick this time, but I have a feeling it was the first on Monday. Typically I don't feel ovulatory pain, but since I was on clomid I feel like my eggs were ginormous and I could feel it. I felt the ovulatory pain Monday evening. My understanding is that the temp rise means the egg has been released, not that it's dead. After release it's "good" for 24 hours. I would do an IUI the day after the OPK, not that day of, I think you'll be too early with the day of.
Hope this helps, and good luck!