Teething?
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He’s also started doing this thing with his tongue almost like he is rubbing it against the teeth
He could be irritated by the teeth moving under the gums, even if the actual tooth takes a little while longer to come through. My little one cut his first tooth last week at 17 weeks and the second cut today. He was teething for a few weeks before this, doing a lot of what you're describing but his poo was also super green with lots of mucus from the incredible amount of drooling he was doing. Some babies are born with teeth so it's possible at any time. Besides going through a lot of bibs every day, we used loads of different types of teethers/toys in different textures and we recently gave him some teething powder too
My first baby cut his first tooth at 17 weeks, so it definitely isn’t too early!!!
My baby is 14 weeks too, and he’s doing exactly the same drooling loads biting his hands and being really irritable. I saw a video online of trying to put a glass on your babies gums to see babies teeth if they are coming through maybe try this as my LO bottoms two teeth i can see and thats what is irritating him but my LO is being really fussy and won’t take any dummies at the moment.