Unless you are under 5'0", you're not overweight. When you're not overweight, there is no predicting or controlling weight loss. You can still lose, but there's no way to know when it's going to happen.
It helps to think in percentages. You can reasonably expect to lose about 2% of your excess weight per week, ON AVERAGE. (Not every week; it just doesn't work that way.) If you have 100 pounds to lose, that's about 2 pounds per week on average. If you have 10 pounds to lose, it's only about 0.2 pounds per week. That's just three ounces. A bathroom scale can't even measure in increments that small, so at best you're only going to see a change after about a month.
You're not doing anything wrong. You're just looking for changes that you can't see with the tools you have available. It's like trying to watch a tree grow. You can't actually see it; you just have to take pictures VERY far apart. Weigh yourself once a month or once every two months, and you'll be more likely to see a noticeable change.