Clear Blue Rapid Test

So my husband is out of town on a trip and comes home tomorrow. We have been TTC since last October with no luck. This app has correctly identified the day I was going to get my period for the last five months and it always comes at night. This morning I was supposed to get my period and it’s not here. Normally I would’ve just waited but seeing that my husband is gone and coming home tomorrow, I want to know in advance so I can surprise him. So I took one of my tests and it came back negative after the three minutes wait. An hour or so later I came back to discover this. Does anyone have experience with evaporation lines on CB Rapid test? I’m trying not too get too excited.