An EKG machine cannot tell you whether you're fine or not. Not all heart attacks show up on EKGs, which is why the hospital will do a blood test for Troponin,

An EKG machine cannot tell you whether you're fine or not. Not all heart attacks show up on EKGs, which is why the hospital will do a blood test for Troponin, too. A home Trop test would do what you want, but it can take several hours for the test to turn positive, and the hours between the onset of pain and the blood test showing that you're having a heart attack should really be spent attached to a cardiac monitor and in the presence of trained medical personnel, i.e. in hospital.