Can someone tell me if my baby is teething?

He’s 5 months and pretty big. He is chewing on everything and really drooly. So I think he is but when is he gonna cut a tooth I took photo of his gums. Could someone maybe look at them and tell me if he actually is teething or when you think he might cut a tooth. Also he was crying and a bit sick when I took these. It was right before I gave him a bath so he was pissed.