Clearblue Advanced: 4 high days then low. Should I test again or did I just miss peak?

Silly, I feel so let down as the flashing smiley faces were exciting. I was expecting either another day of flashing or peak and didn't even consider a low result. It's my first month on this tester. I don't want to waste a stick but wonder if maybe urine was too dilute to catch the surge.

The <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> changed my ovulation day to 3 days from now. It has seemed to be pretty reliable but I don't want to screw up the tester by testing again. E

We only have 3 vials and the donor is no longer available.

Oh life.