I lost 2lb on my 2nd week, and was devastated. Knowing that I had been strict, not cheated (why anyone would cheat is beyond me..) I was drinking 5 litres a day, and I just couldnt believe it.
I took advice from the girls on here. I dropped my water intake to 3 litres, and Ive had a steady couple of losses of 5lb.
I also suffered from constipation, and on that particular week, Id used Fibreclear. I stopped using that, and I now use sennokot, which has been a great help.
Good luck for next week.