Book symbol

I have your clearblue advanced digital with purple caps. I had a peak solid smiley for 48 hours and now my stick has only been showing the book symbol. I still have multiple test strips to be used for next month should I need them but now the tester is broken? Seems to be a common problem. Ugh, as if trying to conceive wasn't stressful enough now to spend money on stuff tart just breaks.