Not taking

My son is 19 months old and he was saying a few words and now he’s just not saying anything no matter how hard I try to get him to. He’s extremely smart and understands what I’m saying he understands when I tell him to go wash his hands or go to his booster chair or clean up his toys and makes very god eye contact but I’m worried that he isn’t talking. He talks his own language a lot and is just so smart, should I be worried?