Ummm.....In MY opinion, if my wife were to put her wedding ring in my suit case when I went on a trip like this one, I would take that as her telling me she wants to break up. But thats just me. I certainly wouldn't take it as a reminder to think about her.
Unfortunatly, we can not turn back the hands of time, and what you've done, is already done. When she calls, tell her why you put the ring in there BEFORE she gets a chance to ask about it. Just my .02