I always reduce the number of trades i place when am experiencing loss in the market so So far I have seen that if I open my trade after a study news thread, use money management tools, use SL, TP or trailing stop then we can easily reduce our possibility of loss, we may also use some indicators like bollinger bands let alone You do not have to wait until you have a loss before you can do something but When a trader facing some problems in the trading and loss in the stock.