I have an ivf conception with dcda twins. Got cervical cerclage done in 16 week as cervix was 2.5 cm. Done my anomaly scan today in week 21 and cervix shows 2.7 cm. Is this normal? Rest as per doctor in anomaly all is normal. Also I am on regular calcium, iron, folic acid supplements along with mbryosafe and coparin injection daily. Kindly advise.

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