Why is it no sound when receiving a text messages?

Hello. I bought this my phone last may 16,2018. The brand of my phone is SM-J730G/DS Samsung J7 pro. And then now after a weeks , i noticed that when im receieving a text its no sounds?Im wondering why? All my notifications are working well. I received phone calls with have sound and by email also i received with have sound. I can play music and those are working well. But why is it my messages only are not working? They do vibration but no sound when recieving? I already check everything in my phone or settings but still the same? Could someone will help me how or where? And what im gonna do? Please thank you .

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