Worrying yourself sick won't change the results, so try not to worry. It could be nothing! 75-80 percent of all biopsies are benign. I know two weeks seems like it will take forever, but that is really pretty quick turnaround. It's often six to eight weeks for a followup appointment at the breast center I go to. I've never had a needle biopsy, so I'll let someone with more knowledge answer that one.
"There's a difference between a philosophy and a bumper sticker." --Charles Schulz