I am also at 4 weeks post-op and hit a stall about 10 days ago….super, super frustrating!!! I got the same advise from everyone and just kept doing what I was. I got on the scale this AM and was down 0.5 pounds. Not much, but it's something!!
Another thing I was advised to do was to re-check my measurements. If you have not taken any, I recommend you start! I found that I had lost ~ 9 inches total. I also have been taking pictures and could really see a difference in them when I looked at my last 2 sets - 2 weeks apart.
So despite no weight loss at the scale, I was still loosing inches!! And I had also dropped another pants size. My dietician also sent me an article and it was also very encouraging that this is totally normal and will pass and the weight will start to drop again very soon.
Good luck (to all of us)!