Teething?

My baby just a few days ago randomly stopped sleeping good at night. Hes not been his happy smiley chatty self through these last few days. He just fusses and wants to sleep ( I guess where he isn’t sleeping good at night he’s tried during the day ) he usually is so smiley and chatty but all he does is fuss and cry. He’s been chewing his fingers like crazy and tugging at his bottom gums and drooling like crazy. Does it look like he has teeth coming in? He just tired 4 months not even a week ago! This is the best pic I could get.