Positive test then negative?

I took the first test with midday urine the day before my period was supposed to start, and it's a clear positive (to me atleast) showed up in the timeframe, but disappeared after a few minutes. The second test is a BFN and I used fmu the day my period was supposed to start but didn't. Was it a false positive or invalid because the line disappeared? 😓 anyone get a positive then negative? I'm so discouraged. Last two pictures are today's test, the BFN. Has this ever happened to anyone else?? Wereyou pregnant or no??