I don't think you have cause to worry.

我认为你没有担心的理由。

youdao

A few children went home and said, "I'm going to Japan tomorrow, but you don't need to worry, mom, 'cause I'm going to be home at 8 o'clock at night".

有些小孩回家后说：“，我明天要去,日本了，不过妈妈你不要担心，因为我会在8点钟回家。

麻省理工公开课 - 媒体、教育、市场课程节选

Now she's gone, gone, gone and I don't worry 'cause I'm sitting on top of the world.

NPR: Blues Song Is a Decades-Long Music Lesson