OPK result advice

Hi, this is my first month trying opk’s.

I started right after my period finished out of interest to see what happened.

My cycle is normally 28/29 days. Glow suggests ovulation CD14 but the test results start to get darker on CD 11 and 12 but has lightened again without seeing a peak.

Do you think there’s a chance the peak was after I tested on CD 12 and before CD 13?

Also maybe I’m drank too much water?

I’ll keep testing to see what happens over next few days.