Waiting on the big O

So I'm CD12 and I'm just waiting for my OPK to give me a +. Once that happens I call my Doc and have the IUI the next day at 10am. Every test I've taken says I'm due to ovulate the 10th Friday. Its our first cycle TTC. I'm full of excitement, positive thoughts. But also don't want to get my hopes up. Praying and Baby dust!