BFP?????

Bridget
I'm trying to stay calm and not get my hopes up. I have taken test in the past and they are always bfn. Tonight two test were taken one was a bad test. No secondary line. So test number 2 came out BFP there was clearly a line. But minutes after the test it was gone...has this ever happened to you. Of so did you still get a BFP? Help!