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.
I'm 15 weeks pregnant through ivf with twins. Went through ivf due to a previous silent miscarriage (at 8
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