Question about EMG

I had an EMG on my left leg and left arm that came back negative about 3 weeks ago after suffering fasciculations all over my body but mostly in those two limbs.

Now my fasciculations have moved more to my right leg and I am experiencing what I believe to be weakness. Would an EMG pick up ALS in just the spots it was tested or would it show some signs of ALS in other limbs.

Also, does fasciculation in a limb mean that ALS is starting to damage that particular area or it just means you might have ALS and it is damaging somewhere else.

I'm wondering if I should get another EMG
 

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