If it's bothering you, talk to your ortho. Also it would be wise to talk to your ortho about your tongue ... as that will undo any work your orthodontic work does.
Definitely don't buy an over the counter mouthguard, as that will prevent your teeth from moving, as that's the purpose of a mouthguard ... the opposite of orthodontics.
Great that your alignment phase is over and you ortho is now using a square archwire to do the tipping and levelling.
Here's to your teeth continuing to do so well! :thumb: