[video=youtube;EwxLZgjDadU]http://www.youtube.com/watch?v=EwxLZgjDadU[/video]
Are you in 12/12 already? If so don't mess with it the shock will screw up your flowering, if not read below.
Is it 2 weeks from seed or 2 weeks as a clone makes a difference. 2 week old seed no, 2 week old clone could be transplanted today the size of the pot is up to you, are you going to transplant it and than put it into flower in a week, 3.25g would be fine, if you want to veg it another couple weeks go 5gal, also what is the space you're working with, light you're working with?