really confused

so i took a pregnancy test last night (7pm) and it was positive w a second faint line. Later on i took 2 more and they were negative.. so am i pregnant or was the first one a mistake. Maybe bc the other 2 were a different brand? Idk i don’t want to get my hopes up. I have an appointment to actually get tested in a few days and i don’t wanna get my hopes up but idk.