Low to Peak in 1 day?

Michelle • Boy Mom 💙 Ethan & Noah
Hello,
My husband and I are ttc our first. I used clear blue digital opk on cd8, cd9, and cd10 and got low fertility result. I used it on cd11 and got a peak! Is this normal? I thought it would go from low to high to peak.
Also, is it true that using saliva as a lubricant decreases your chances of conceiving?