Hi aph:
Having your wife out with the OM is not fun. Been there, done that. Pretty much straight out horrible. You certainly can, and should say something to her when she gets home. Remind her that her actions are disrespectful of the marriage, that you're not willing to give up on it, but she's hurting your love for her. Do that without lovebusting... simple, straightforward facts.
You're only a couple weeks into this. You don't need a PI here---you need some coaching from the Harley's. I've given this advice to you before, and I'll continue to sound like a broken record---at this point in the affair, it's critical to get some grounded, professional help. Once you understand Plan A and are successfully working on it---you can lay off the counseling until you're ready to transition to Plan B. But do it now.
The stuff with spying doesn't seem to be a good use of your time. When you suspect an affair but aren't sure---that's a good time. You know that there's an affair going on. Even if you can't ID the guy---does it really matter?
We have had this talk every night since D-day and she is tired of the pressure and cannot wait to move out she "needs space to be able to think" I am trying to get her to stay and back off at home, but she constantly contacts him in my presence.
You're harping on your wife, and she doesn't like it. If you're going to do Plan A---you need to readjust. In fact, there is material on this site (maybe the old Q&A's) where Harley actually recommends that if your spouse is so committed to moving out, you cheerfully help her to do so---all along acknowledging that it's not what you want...
Affairs love secrecy---which is why it's important to expose them to the spouse. Affairs also love the 'part time' nature of the relationship. Let 'em have each other 100% of the time, and see how that works out...
Seriously---call the Harley's and make an appointment. Tomorrow.