Easy@home hcg test question

Has anybody ever tested early with these, got a vvvfl within timeframe, then later that line disappeared (and ended up being preggo)? I had a very obvious faint line earlier and i just went to look at the test again and it’s not there anymore...

(PS I have checked my batch number to make sure I didn’t get a faulty box, and the one I have is fine. So im lost.)