Is the dreadful teething upon us?

An

LO will be 4 months on Saturday and this last week he's been drooling non-stop and anything he can get hid hands on goes in his mouth. He's been a little more fussy than usual and today when I put my thumb under his bib into his mouth he was going to town, it kind of hurt he was knawing so hard. It looks a little more ridged on his bottom gums and some white pressure spots, is it that time already??