Teething? 20 months

Ash

So my 20 month old son has been very fussy at bed time the last couple of days and waking in the middle of the night crying, no fever but very upset. He was drooling a LOT today so I’m wondering if his last set of molars are coming in early (i know they say 25-30 months is when they come in). Anyone else’s baby have theirs come in early? I’m considering taking him to the pedi tomorrow to make sure he doesn’t have an ear infection starting.