I have been tracking my period for a while but am currently in first cycle tracking bbt and using opks. I am on CD 16 with no temp spike yet. I am using the cheap wondfo opks and started testing on CD1 just to get a feel fo it. I felt like the test line was getting a little darker over the last few days (but still significantly lighter than control so never positive) then today I tested and there was almost no test me, right back to the palest u have seen it?