Opk question

Sarah • We just had our rainbow baby 2/3/19 after 5.5 years of ttc and 3 miscarriages.
Alright ladies this is the first time I've used OPKs while on Clomid for PCOS. I have been using the Clearblue digital OPKs + BFP brand OPKs. I have yet to get a positive (at least I don't think any of them are) and I feel like they may be getting lighter recently... Idk. Lol maybe someone can tell me if they are looking right. The blue test if from the CB digital after I got the empty circle. And the dates are 7/28-8/1 all testing between 1:30-2:30.