I was standing at 150.2 lbs this morning, and without giving too much information, I believe that I should hit the 40's very shortly.
I took my measurements last Friday and in a week, I lost 1.5 " on my bust (Alleluia!) and 1 3/4 " on my hips. I had my periods this week, so this might explain the good results.
Dottington - A size four is fantastic and ideal for your height. It means you have muscles and you are fit. Congrats. Do not focus on the scale. I remember that as a teenager, my friends were always stunned by my weight. I had very little body fat and was fitting in the smallest jeans. They thought I was in the nineties, but I was around 110 lbs.
I do not know if you can do this at home, without professional help, but you should focus on your body fat percentage (or measurements if you can't).
So, let's keep on keeping, ladies!