I can relate to what your feeling, on my first fill my Docter put in 2 cc's, I felt nothing and did'nt lose a pound. On my second fill he put in 2 more cc's and I lost 12 lbs in 6 weeks, went back to him for my appointment and he did'nt put anything in. 6 weeks later I went back to him and only lost 1 lb. He put in 2 more cc's, and now I feel the difference!
Be patient, it may take a few fills before you really start losing. The only thing I should have done is gone back earlier when I was'nt losing so give your Docter a call in a couple of weeks and ask him/her for a fill.
Good luck and hang in there, it will happen.