my watch is RUNNING BEHIND?

[Duc]

Please imagine a context when I dramatically realize that my watch isn't keeping accurate time.
So Can I say:''my watch is running behind'',or it must be anything different ?
Is that the most popular way of speaking.
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Don't see your shade think you are great

[Yankee]

Hi duc

I'd say the most common expression is "My watch is slow."
.

[Nessie]

Or you can also say:
my watch gains 20 minutes a week
or
her watch loses 5 minutes daily
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... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...