Lose 7 Pounds in 3 Weeks?

My final weigh-in with the biggest loser is on April 18th, so in order to reach my goal I need to lose 7 pounds.  This means I need to lose about 2.4 lbs a week....yikes I'm not sure if I will able to do that.  Although this is going to be a hard goal for me I want to push myself the next three weeks just to see if I can get close.  So far this week I've worked out twice and I plan on going to the gym today. So hopefully with my hard work at the gym and at home exercising I will be able to accomplish my goal.  Wish me luck!