Interviewers usually do not tell you during the interview whether they recommend to let you pass or not. So the “good luck” comment is likely just a platitude in terms of politeness.
At the current stage, it is certainly understandable that you let the interview replay in your mind over and over again, trying to analyze whether you are going to get an offer. However, the truth is that you won't know until they tell you. This is usually discussed among the recruiter and the interviewers in a formal round. Scheduling conflicts might cause such a meeting to get postponed or delayed in some cases.
You should hear back by next week. If not, you can probably politely follow up with your recruiter regarding a status update.
Best of luck