. As for the OPK's, the best time of day is supposed to be between 10am and 2pm, or some women even do them in the evenings, with the window there being in between 5pm and 9pm I think. Never use first morning urine
isn't too diluted. Being that it's your first time, and since it's important you get it right for IUI planning purposes, I would probably do 2 per day this cycle and see what happens (1 in the afternoon and 1 in the evening). That way you can be more certain you don't miss your surge. Going forward though, only 1 per day is needed. Have you been tracking your cycles and have an idea of when you O? It's important to start your OPK's early enough since your surge will typically happen 12 to 48 hours before you actually O. Hope this helps. Any other questions, let us know. Good luck to you! :)