Joanne ~
I know you've probably read enough answers to your question by now but I wanted to add my response, for whatever little it may be worth to you.
I received a call from my PCP approximately 2 days following my MRI scan. He called me at 7 P.M. via his cell phone and explained that the MRI, which he had ordered expecting me to have some kind of 'sinus condition' to explain my loss of taste, showed an acoustic neuroma. "A big one", as he put it, and "too big for GammaKnife". I muttered affirmatively but really had no idea what he was talking about. He explained that the tumor (scary word!) was very likely benign but was causing all my symptoms. Within hours I had haunted the internet seeking explanations of 'acoustic neuroma'. By the next day, I understood what the MRI scan had showed and what I had to consider. My PCP had already scheduled a consultation appointment with a local neurosurgeon, who I did see but I ended up hiring a different neurosurgeon who did a fantastic job.
In your case, two weeks seems an awfully long time to wait. I trust that you'll hear something long before then, although as other posters have pointed out, there are a lot of variables and if the MRI shows nothing, there won't be any urgency to contact you. Of course, that would be a good thing.
Jim