My daughter, who is 18, and I, who am 55, are on day 23 of our 40 day fast. We don't know how many pounds we have lost...Katrina got the scale...but we decided not to worry about weight. In the past, we would get upset if the scale didn't move every day, which sometimes happens, especially if you are still menstrating (you can even gain before your period starts). We are just going by how our clothes fit. We have both lost weight by that guage, and that is good enough for us.
If you are going to weigh yourself, don't do it every day. Do it once a week, and at the same time of day, since your body can fluctuate at different times of the day. Don't let the scale ruin your experience, or your life.