「虚惊一场」英文怎么说？

false alarm 

假警报、虚惊、虚惊一场

A false alarm drew firefighters to the school. 

一场假警报害到消防员往学校白跑了一趟。

She thought she was pregnant, but it turned out to be a false alarm. 

她本来以为自己怀孕了，结果发现只是个误会。

He thought he might be having a heart attack, but his chest pains were just a false alarm. 

因为最近胸口疼痛，他怀疑自己得了心脏病，结果原来只是虚惊一场。