I am currently 35 weeks 3 days pregnant.my AFI level was 12.7 cm on 27th nov 2016.then 13 cm on 21st nov and 16.6 cm on 8th dec.i was also daignosed with gd and TSH m taking 500 mg metformin twice a day.i am worried about my baby's birth defect if there is any as I have heard increased amount of amniotic fluid is associated with this. What should i do?how can I ensure my baby is doing fine.his weight is good 2.5kg.