OPK help!! Please!

Julie

Top to bottom

11 Jan

12 Jan

14 Jan

15 Jan

I am so confused it looks like I was almost there on the 12th, then really faint the 14th (I missed the 13th) but getting dark again today. Did I ovulate early?? My predicted ovulation according to glow is the 20th, my other AP says the 17th. I will keep testing but looking for insight?