Hello Ahmed
The senior members have already answered your specific question.
Being a novice trader myself, I can empathize with your situation; its very hard to see all your gains vanish in just 3 days.
Discipline is the most important thing in trading. Before you enter any trade make sure you are aware of the risk reward ratio, take only accepted risks, and this keeps emotions at bay when the position turns adverse.
Do read about trading psychology and position sizing (Money Management), you will find excellent material on this forum, I may provide you links to them, but just in case you decide to browse you may end up reading better stuff.
Regards
Sanjay
http://www.traderji.com/risk-money-management/
http://www.traderji.com/trading-psychology/