I am close to you, I'm on CD6 but I had a 38 day cycle last month so you will probably be ovulating way before me lol. How long are your cycles?
As for the opks, this will be my first cycle using them and I should've started them today since AF just ended but didn't have a chance to go buy some since I worked all day today and tomorrow. So I'll be starting them the day after tomorrow. I also plan to keep all of them through out my cycle so I can compare the progress of them.