No.... everyone is allowed the odd career crisis. It may be worth giving BAS a few months to see if you just have a bad case of buyer's remorse, but either way, in the future, it will be nothing to worry about. My very short lived stint at Deloitte (2 months) now makes interviewers laugh, I can prove I've learned some lessons from it and it didn't stop me getting the job I have (and love) nowGood luck!