Has anyone experienced this during early days of a new job?

So I applied for a job, the interview over the phone and in person was 5 minutes she told me she will call in a couple days and then when she called she told me to come in so i assumed I got the job. I go in on the day she asked me and she never asked me about my bank stuff for paying me she only asked me for my references. Near the end of the shift she showed me a sheet of paper talking about pay checks and saying "if i get hired".. then goes on to explaining what to do if i get hired. So am I on a trial run or something?
Has anyone experienced this during early days of a new job?
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