LH surge? Help.

Hi!

I'm confuse as to why the LH was getting darker on 8/4 then out of nowhere went light for 2 days now dark again?

I'm 2 weeks late now and its frustrating getting neg test. So I tried to chart last week to see if I was going to even ovulate.

(Pls note I'm only testing once a day to see how this all is)

Is today Pos??