Nifty is going to open at crucial level - 16855.

Broad Range 16942 - 16801
Narrow Range 16875 - 16801

Either the price will go away from the 16855 or it can start to fall from this level. In this case, what you should do. For in the trading, a small loss is the part of the game and nothing is 100% sure for "a perfect trader". The important is a sign, clue, and evidence for reversal such as volume, price action, and closing level of higher time-frame.