OPK question

Hello ladies!

I’m new to the OPKs...this is my first month trying them. so the tests started light then kind of dark-ish but today I’m noticing they got lighter instead of darker 🤔 any idea why? From what I’ve seen on other opks posts mine never reached high or peak! So I’m confused....Thank you!

PS- My cycles are 32-40 days (never had a cycle less than 32 days) no O symptoms (no ewcm, not watery cm, more like creamy) may e I’m doing something wrong??? 🤔