So have you been measuring inches? Sounds like your body is changing even though you don't see pounds dropping. Focus on that. If you're working out, I'm sure your body is looking better too. Take weekly pictures of your body at different angles to see progress & keep track of measurements. I started doing that pre-op in case I had a similar issue. As a kid, the scale always said more than what I looked because I was very muscular. It's hard when our measurements are by scale.
Have you measured with an actual BMI pincher ? I think that will help you see your progress. Good Luck!