My Dr said the first 6 weeks are for healing not weight loss.
You just had major surgery. Your body is focused on repairing itself not losing weight.
Google 3 week stall.
It seriously feels like no one did any research pre-op and just had surgery. If you have ever read any WLS boards there are lots of answers to this kind of question.
Do some research so you know what expect and don't stress yourself. You need to be focused on healing and you can't if you are stressed.