I have been following the old flex plan (well tech. this is my 5th or 6th time lol) I would say if you are losing 1 to 2lbs a week you are where you need to be.
The best tool is to journal journal journal that way you can see what you did that worked and what didn't. And please remember our bodies are fickle and don't always cooperate with our wishes.
If your clothes are feeling less tight then I would say you are where you need to be.