Help me again....Please !

Ok this is my second month to use OPK.  I started OPK on CD 11.  Now, I'm on CD 13 and it seems the line is getting lighter, not darker, like it should.  I surged on CD 15 last month.  So, what am I doing wrong?  Will the line get darker again closer to my surge or have I missed it all together?  RE told me to start testing on CD 11/12 and that's what I'm doing.  Dh and I have been bding every day since CD 9 and will continue until time for my next period, just to be on the safe side.

[sweetangel7]

Maybe you surged before the 11th?  Wish I could help more!