It is observed that your query is in context to Pakistan. The practice and labour laws are different for two countries. I am replying in indian context. Actually 3 days are not too much time that you should start worryingly about the result of interview. You know that after interview the HR dept. will decide your salary, placement, dept., on the job or orientation training, data base etc.etc. because their Dept. is responsible for the manpower planning of the organization.
My advice is wait for another week's time and then you enquire
from them about the fate of interview.
Member Since August, 2011