But have you continued to use them? If you are truly ovulating later, you could have had a surge on Sun/Mon, geared up to O, then not. You may be experiencing O pains now, in which case, you might be having another surge.
My gut tells me that you're in your 2ww, like you said, at which point all you can do is sit back and stress about every little thing your body is/isn't doing. That's what the awesome 2ww is all about