Hi

Thanks for posting your query

Here are few facts that will clear your doubts

Gall stones up to 5 mm may easily pass through the common bile duct in to the duodenum[Small Intestine] as the upper limit of normal common bile duct on Ultrasound studies is 6 mm

Otherwise also solitary symptom less stones less than 5 mm and bigger than 1cm can be left alone

So you need not worry with your Gallstone but on a safer side go for a repeat ultrasound after 6 weeks or if symptoms appear

Hope this helps
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Get Well Soon

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