well if you do it carefully it shouldn't be a problem, most plants start acting a little weird after transplant because you shake off a little dirt from the roots before putting it back into a bigger container with soil. I would just put some soil into a bigger container, carefully place the plant on top of it, and adding soil to the sides. Since you're already in week 4-5 you might not have so much growth anymore but better safe than sorry. Best case scenario will give you some more bud, so i'd go for it.