Don't read into anything my friend, usually the member does not show emotions unless they feel good about the case, mine didn't show any emotions at all and I felt he wasn't looking at me at all, he gave me a positive decision at the hearing, and 6 weeks later in still waiting for my notice of decision, as for. 3 weeks yes it's very normal usually it's an average of 6 weeks, it can take up to 5-6 months according to what I heard and seen, never means positive or negative, it's just covid backlog, and time to review the case and compile the reasons for the decision, these days they process so many hearings in a given day that there are many cases to be processed at once, this is my experience and what I understood so far.
Best of luck.