IPhone rings but no new message?

My iPhone rings at 7:30 every morning as if I received a text message. Nothing else in my settings has that same ringer. There are no alarms set at that time or reminders, so I have no idea what it could be. What could be the cause of this?

Added (1). @Chantal Those all have a different ringer. So it shouldn't be anything but my text messages that have that ringer.

Do you have a alarm app or it could be from your calendar as you can set alarms on them?

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