I got frustrated I wasn't "losing as fast as I should". It was my hubby that brought up a great point... are you gaining? He said, "if you step on the scale and weight more than you did at the start, that is the time to worry" Smart man once in a blue moon
Just stick to it and the weight WILL come off. I stayed on phase 1 for 3 weeks because I didn't have the huge losses others had. I only lost 4.6 pounds the first week, 2.4 the second. We all lose weight in different ways at different paces. The important part is you lose the weight!
I try to only monitor my weight in the middle of the week. My weigh in day is Sunday, but I check the scale on Wednesday to see if I've lost anything, if not, I scale back my diet closer to a phase 1 meal plan. So far, I've consistently lost 1-2 pounds per week.
Carry a notebook with you and every time you eat or drink anything, write it down. That was you can monitor what you're eating. I noticed you said, "occasionally I have some kind of nuts, but stick to the amount I am allowed..." Are you having it once per day? How many are you having? Track your eating for a week and see if there is something you need to tweak. But really, I just think you had such a huge loss the first week that your body is adjusting.
Just stick with it!