Ecg app Pakistan

ECG is not currently available in Pakistan. Here is an official Apple Support link, where you can see everywhere ECG is supported --> watchOS - Feature Availability - Apple

This is as definitive as it can get as this is directly from Apple.

Here is a list of countries that support the ECG app;

watchOS - Feature Availability

Pakistan is not on the list.

No. The watch will know where in the world you are.

For the ECG app to work on your watch the ECG app has to be approved by;

A. the government of the country in which the watch was bought and

B.the government of the country in which you reside.