ovulation predictor confusion

Nikki • Nikki
Has anyone explain experienced this... 
Cd 10 started testing I have a 26 day cycle. Past cycles always have a peak day cd 13 I am trying new tests this month not clear blue. I am now confused as they were getting darker and now I literally have a non existent line!! Like there's nothing surely it should be getting darker as day 12 today? 
Day 9
Day 10 
Day 12 
Pictures aren't great sorry but no 2 was getting on control line colour now it's faint? No signs of ovulation yet ewcm etc? 
Thank you in advance xxx