Clearblue advanced fertility monitor NO PEAK

Allison

I've been using the clearblue advanced fertility monitor for 7 months now. I have only received a peak reading one month out of the 7. Yesterday it continued to have me test and I had gotten a high reading for 10+days. I put my test in and it read high but then noticed I had started my period. I logged it on the machine and it then changed my reading from high to low. Seems kind of fishy to me. Wondering what others experiences have been?