probably not
I don\'t think you are allowed to do that. I tried that before and was told I could do that only on the day specified on the FP notice, or to call INS to re-schedule FP date, which could significantly delay your process.
I don\'t know why they not allow to do FP earlier than the scheduled date and the office did not look busy: the time I did my FP (1:00 PM), only me and my wife were there.