I suspect the tech saw some ectopic beats and when they stopped the test your cardiac rhythm returned to normal. If they had documented anything life threatening I believe they would have admitted you to the hospital.
It is a good sign that you had not chest pain or any sx with the extra beats.
If you should experience anything out of the norm do not hesitate presenting to the clinic or the ER just to be on the safe side.
Big breath and I will keep you in my prayers that nothing seriously is wrong.
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