I think its possible I might have food poisoning. But I don't think anything I ate can go bad. Would it be ok if I took pepto bismol or tums (calcium carbonate)?

Go ahead! Why do you think you have food poisoning? What symptoms do you have? Taking pepto or Tums (calcium carbonate) will not do any harm but if you have no symptoms, why do you want to take these medications. It is not a good idea to take any medication, unless it is needed.