I woke up yesterday morning with a bump on the roof of my mouth and its gotten a little bigger this morning when i woke up what can it be?

Many Things: But most likely an infection, either endodontic or periodontic in nature. A tooth may even be fractured. it's impossible to tell for sure, over the internet, sight unseen. Please call a local dentist for an appointment for a definitive diagnosis and treatment options.

Bump: Area of swelling that is expanding indicates an active infection. May be a tooth abscess or gum abscess. These lesions do not self-heal. You will need professional care, and the sooner the better. Please call your Dentist, report your symptoms, and request an appointment.