Is my doctor wrong about teething?

Keri • "Happiness can be found even in the darkest of times ; if one only remembers to turn on the light"

My son is almost 5 months. The last few days hes been putting every thing he can find in his mouth and gnawing away, drooling like crazy, muchn fussier than usual and not sleeping through the night anymore.

My pediatrician said he isn’t teething yet. Could he be wrong?