I'm a little concerned...I use clear blue Digital opks and have used them since February so I know my pattern. I started testing yesterday cd12 ( I skipped the two low fertility days) and I got a low reading. I usually get a peak reading on day 13 or 14 ...Today was low and the strip was lighter than yesterday. Yesterday's cm was light I would classify it as ewcm....I don't know what to make of this.