Shall we anticipate regression results？ Shall we anticipate the regression result? Saying the coefficient sign . 


If not, why?
If so, what should we do when it fails to achieve anticipated results?
Saying what the theory predicts is a good idea as then we can make a testable hypothesis of the theory. Much of empirical economics is to test the validity of the theory. 

If your result conflicts with the theory, then you can try to rectify the conflict or propose a better alternative.