You should definitely not be disappointed.
You will read on this website that so many people have stalls... sometimes they last days, sometimes weeks. It has happened to me. When I was 2 weeks post op, I stopped losing weight for 2 weeks.
Remember, you just had major surgery... your body needs time to heal and get used to the new changes.... the surgery itself, weight loss, etc.
Also, from what I understand, the lower your starting weight, the slower the weight might come off. Do your best to try not to compare yourself to others weight loss. Yours might be slower and there is nothing wrong with that. Keep following your doctor's/nutritionist's plan and you will do just fine. High protein, over 64 ounces of liquids daily and a low carb diet.
WIsh you the best. Keep your chin up.