Just pull it out again and lay it on the ground the opposite way for 6 days. That should fix it.
I'm kidding, it's impossible for a 6" tree to bend in 6 days even by Chris Angel or David Blaine.
Something seems
The tree probably had a bend in it before, you just never noticed it. I agree with the previous posts, seek professional help (for the tree) to see if there is a viable solution.