Theoretically, 3.5cms is desired. But clinically, many doctors take a cut off of 2.5to 3.
With a value of 3.1, it's borderline. You may avoid unnessary travel. And just get a second opinion.
Your anomaly scan at 18-20weeks will give further picture whether is it maintained at that or changing.
Next Steps
may take pregnancy support medicine(susten) if your doctor advises.
Hi doc my cervix length during first scan was 3cm then during my 13 weeks scan my cervix length got reduc
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