Cervical length check

Kisses - A
I am supposed to have my first cervical length check tomorrow. (Almost 17 weeks) then I get them biweekly from 22 to 28 weeks. Has anyone had them before that can tell me what to expect? My first was born at 27 weeks due to unknown preterm labor and dialation and classical c section so I'm high risk but I don't know anyone that had the length checked. TIA.

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