I am supposed to wear my invisalign trays for one week and then change them. after wearing tray 1 for 4.5 days it feels completely normal. can i change into tray 2 2.5 days early if it feels like they fit well?

Orthodontics: Tooth movement, whether via traditional brackets and wires or by plastic trays must be accomplished in a slow, steady pace. Bone resorbs on one side of the tooth socket, whereas bone remodels and forms on the opposite side of the socket. Trying to move teeth too fast can cause permanent damage to the underlying bone. This damage cannot be repaired. Follow your instructions.

Absolutely not: Just because the pain-mediating levels in your tissues have dropped to a comfortable level does not mean that the trays have finished moving your teeth. Please follow the instructions from you treating Dentist or, hopefully, specialist Orthodontist. You are paying a lot of money for his/her expert advice. Follow it. Shortening tray time will lengthen treatment time and/or compromise result.