First of all: CONGRATULATIONS!!!!
Under 140 is my goal, but at 4'11" I know I will need to go farther. Under 138 just gets me out of being obese, "BMI-ily" speaking. My ultimate goal is to have a "normal" BMI.
But for you - you seem to feel great and proud of your weight loss. Do you feel like it's enough? Did the doctor say why you should loose more? I think you should enjoy your weight loss and maintain it for a while to see if it really fits you, unless there is a reason to loose more.