OK Question

I used the Advanced Clear Blue OK during this cycle. On the first two green days according to Glow, I tested low fertility. Then, for the next 6 I tested high. On the 9th day of testing I tested peak fertility and on the 10th, low. Is it normal to have 6 high days and then only 1 peak. I plan on testing again next cycle and already have the ClearBlue. Should I try another brand in comparison with the CB?