Can I change my Invisalign treatment plan once the trays have already been made? (Photo)

Hey everyone, Im on week 3, tray 3 of my invisalign treatment. I have an overbite and the way my current orthodontist is fixing it is by moving my bottom teeth forward and moving the top back and I don't want to do that. I would much rather move my teeth ( bottom and top ) back to fix my overbite, as I feel my face would look a lot better with them pushed back. So I was wondering if I could/what would happen of I changed my treatment plan now(additional costs, ect.)