Have recently been for my 20 week scan and everything seemed normal, but as I was leaving I was advised my baby was smaller than normal and I would need extra scans. From my notes my measurements are on the 5th centile. The next day I recieved a letter to go back for another scan at the fetal medicine unit under consultant care, this is in a couple of days. Is this normal or should I be concerned that my baby's growth is more serious than I though?