I've been there and done that too. I've showed up in my doctor's office a week early (twice) and have gone to my dentist's office the wrong day or time. One time the dentist's office was able to work me in. Another time I had to come home and go back in the afternoon...time appointment was for. One time my doctor's office called to change my appointment from a certain day to another...only thing was my card showed an entirely different day and time. So that time...THEY were wrong.