No cover line?

A

Hi guys so it looks like I am on my way out (once again) this month 😭

I woke up today extremely early after dreaming I was pregnant so the temp today was not at the usual time. Then decided to test and got a BFN.

Anyway my question: I am not clear as to why this month there was no cover line? Looking at my chart can you see where it should fall?

Any help much appreciated😊