have I missed my surge?

My period finished Saturday. I did my first opk last night and the faint line seemed darker than usual so early on. (My fertile week doesn't start til Saturday). This mornings test seemed darker than last nights. But then two more I did today look lighter than this mornings. Especially on the pink strips. I'm so confused. I'm not meant to be ovulating at all yet. All these tests are negative but I don't get my faint lines that dark until im actually in my fertile week.. have I missed my LH surge ALREADY?😫 or could it be drinking that is making them lighter ?