good luck mate, but at 3 and a half weeks old,and only 2", fuck sorry mate i would have pulled them. they are some seriously stunted plants imho it would be better to start over.
you got a soil ph probe mate? if not try and borrow one and see the reading. as for the white flies garlic tablets melted into warm water and sprayed normally will see them off. good luck fella.
top her mate and she wont stretch so much, if your doing a window grow top every top if that makes sense and she will bush up, but will need more veg time to get a tidy result.