Ides is correct in that you need to get a copy of the EKG from the place where it was performed. If it was a hospital, they should have no problem providing you with a copy of it to you, since they know HIPPA laws better than any of us.
However, from your post, it seems to me as if the primary dr.'s office was the one that performed the EKG. I know my general doctor also performs EKG's in her office, even though she never performed one on me. I told her I had a cardiologist and whenever I needed an EKG I would go to my cardio's office instead. FYI, even though my heart was failing (looong story!), I had about 6 EKG's performed at different times for a period of about a year and they all came back normal. Needless to say, I have very little faith on these tests unless you are actually having a heart attack or other major heart arrythmia. EKG's are not able to detect many other heart conditions.