Hi. First post here and I'm looking for some help. This is my first month using OPKs and I'm coming to the end of my projected fertile window with no positive. I've been tracking my CM as usual and based on this I would have already ovulated. What does the OPK mean? Am I not ovulating? Or could it have missed it? Could I just not have ovulated yet and my CM change back? I'm on CD16 so not particularly late yet. Any thoughts would be great!