How long does it take to get results back from a nuclear stress test? I had one two weeks ago for some symptoms, and haven't recieved a call yet?

Unacceptable. Clearly something fell between the cracks. Give the office a call.
You must call. 2 weeks is more than enough for the answer to be communicated to you. The results are usually reported the same day. I would call your cardiologist's office now.