How soon is too soon to try and get a better job?

I recently graduated with my bachelor's and want to work my way up on the admin side of healthcare. I just accepted a position as a float for a medical office position. It is very entry-level, only required a high school diploma, and is going to be good experience for when I want to find a better job because this one does not pay the best. I always thought I'd stay with a job for one year at the absolute minimum, but now that I am getting the experience, I'd like to try and start applying to better positions sooner rather than later. Who knows how long it could even take me to get a better job, but would 6 months working here and then moving in to a better opportunity look bad on a resume?

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