First weigh in with new leader

well after a week of trying really hard to stick to the plan i was feeling positive about tonights weigh in... i had managed to do an hour of aerobic activity on the wii fit 3/4 days last week which was the first time i had done any form of exercise so i was really quite chuffed with that.... so going to weigh in tonight i was quite confident... went in the same black leggings and white t shirt as i wore last week and well stepped up on the scales and closed my eyes.... i lost 0.5lb.. i was ok about it i guess.. but just couldnt understand.. i was drinking water... sticking to points exercising loads and yet only half a lb lost... oh well im kinda hoping that it will show in my results next week......