Two weeks is certainly not enough for quarantine. I did two weeks for a new fish before, and ended up with velvet disease. After researching it, I found that velvet has a 3 week incubation period, so I would recommend at least 4 weeks. I personally am quarantining my new fish for 2 months, since I'd rather be safe than sorry.
I was planning to keep it in Qt for a month. And then if it does not show any traces of a disease, t keep it there for two more weeks.