Hi
Yes our stats are very similar. I am on my fourth week. I did attack for a week and lost 4.8lbs. The first week I did 1.6lb, week 2 - 2lb and then this week was 2.8lb. Don't be downhearted with your losses. They are great so far.
I have noticed a lot of people saying they are disappointed with their losses. I think because most people have a really good big loss in their first week on attack that then going on to lose 1.5 to 3lb a week can feel a little disappointing. However, do not lose sight of the long term picture.
I don't know your dieting history but mine is pretty dismal. I tried, years ago slimming world and ww, with not much success. Over the last four years I have tried lighter life, lost 4 stone and then Cambridge and lost the same 4 stone I had put back after lighter life.
I think the trouble is you have to come to a point when you realise there is no quick fix and it will require perseverance. For me Dukan is working well. I like that I can eat plenty and I don't feel hungry or lethargic, which I did with Cambridge and LL. I love that each stage is well structured. I like that I don't HAVE to go and do over the top workouts at the gym, I hate exercise. I just walk a 30 minute brisk walk a day and I am happy with my losses. Exercise will be my fallback plan for later if and when I hit a stall.
So please do not be downtrodden by your losses, you are doing great. Just think of it as a marathon not a sprint. Plan ahead, make sure you have variety in what you eat and stick to it. I don't even say oh i will just have a little bit of ........(insert forbidden food) I am rigidly sticking to this come hell or high water.