HI, thanks for using healthcare magic
If you are experiencing increasing palpitations, chest pain
or shortness of breath
then you should schedule the ECG at an earlier time if possible.
If you are not presently experiencing any significant symptoms or any worsening symptoms then you can consider keeping the present appointment. It can be changed if any problems should develop.
You can also consider speaking to your doctor to determine whether he or she thinks that your present 2 week appointment is okay or if it should be done earlier based on the result of the ECG.
I hope this helps