Hi Kelly when you get the dark line, which it looks like you definitely did it means ovulation will occur within the next 48 hours so now would be the best time to get baby making. Once you have ovulated your fertility window has gone. You are better off dtd the day you see the positive and perhaps the next day to be on safe side. As for cm, it is weird but also good that none us seem too bothered by it....lol.... I've been tracking my cm over the last two weeks and I reaslided by af was about to arrive as it had dried up! Now wondering, as af came two days early when would be good to start testing with opk's again....I am only on for 4 days so thinking to test 5 days onwards to be on safe side as worried I ovulated early last time. My cycles are quite short.....24 days this month! I guess the only advantage to shorter cycles is not as long to wait for either a bfn or a more wanted bfp! X