I'm 27 weeks pregnant and I've been told at my scans from 20 weeks that my babies long bones are measuring around 3rd centile 2 weeks behind and that my baby could just be a small baby or could have Down syndrome or dwarfism and they offered me the amnio test but I don't want it, i can't stop stressing or being upset and worrying has anyone else had this before or heard of it that can give some advice? Thanks