My Essix retainer is not covering my wisdom teeth, now snug should they fit? (Photos)

Hello I wear essix retainers at night. I actually purchased a new set through the mail after i had cosmetic bonding done to fix some broken teeth and my original retainers no longer fit. These new retainers do not cover my wisdom teeth and are also quite snug. Now I am worrying that my wisdom teeth may hyper erupt. Also, how snug should retainers fit? To remove them I need to hook my fingernail into the back portion of one side of each retainer. Thank you.