I swallowed a piece of my night guard on accident and threw up. will i be ok or should i go to the doctor ?

If no symptoms now: Those little pieces of stuff that are accidentally swallowed (including little bones, seeds, plastic, glass, metal, etc...) will usually be pooped out without causing problems. Dangerous objects are magnets, button batteries, and larger or sharper intentionally-eaten items. If vomiting repeats itself, or if just worried, one can talk with his or her primary care doctor.