What cycle day for iui was it a success?

Jo • Both 41...TTC for too long
Going into 1st mo of trying clomid with iui and nurse has me scheduled for cd11 ? I'm thinking because its a Friday and said if I'm not ovulating to come back on that Monday... Cd14? 
​I vary with my positive opk last mo was cd13, this mo was cd11. So I'm curious. I'm also paying out of pocket so really want the best shot! Thanks for help!