So I normally have 29-31 day cycles, but have been known to ovulate early (#3 was conceived when I ovulated a week early). We decided to try OPKs this month (Clinical Guard from Amazon) and started testing on CD9. On CD9 and 10, I had light EWCM and light spotting. The mid-cycle spotting is something I've only ever seen when I ovulate -- my #2 and #3 are both here thanks to that sign. Problem being that my test line on the OPKs never got as dark or darker than the control! 

And now, on  CD14, I wake up with globs of EWCM and the lightest test line of them all. What the heck? It doesn't show very well in the picture, but there is a part of the line on CD 9 & 10 that is dark, but not the whole line.  Thoughts? Experiences?