I didn't start losing until after my 3rd fill and I think that put me right around 5cc's. I'm now at 8cc's and 100lbs lighter. I lost the 100lbs in about 11 months and have been maintaining for about 8 months. I was just like you, I thought I wouldnt lose and always thought I was doing something wrong but it works just give it time and you will hit your sweet spot in no time!