I'm not sure, but that is the timing that my RE will use too. Washed sperm is different from fresh. It won't live long. So your timing actually sounds good. I think you want to get the sperm in there as close to actual ovulation as possible. The egg lives 12-24 so having the IUI even a few hours after ovulation I think could be sucessful. I think the washed sperm only live 8 hours or so. I've heard that they actually think that many cycles fail because the IUI is done too early--too close to the LH surge. I haven't had an IUI at the drs yet, and I feel pretty nervous about the timing issue already.