Hi, I am 29years old, weigh 90kg, (84 before pregnancy) and height is 5ft 8". I am currently 38wks 1days and at the last scan to check baby's growth, (this scan was carried out at 37wks 4days) baby's HC was 332.9mm, FL was 74.5mm but C was 298mm which, based on charts, means babys abdomen is measuring 3wks behind. Should I be concerned? thanks