A little confused..help?

Je

So I have a clear blue fertility monitor..and I’ve been getting HIGH in the mornings.

I just took a clearblue advanced and got a low (7pm). I held my bladder for 4 hours and didn’t drink a lot.

How am I getting High in am and low now?

I used to get same results (7 am and 7 pm) last cycle.

Anyone know why?

Thanks ladies