Hi, my bubs was small for the weeks all the way through. They said this one would be smaller than my last son, who was 6lb! At 36 weeks my GP requested a scan as I hadn't put on any weight for 3 weeks, and I wasn't sick, I was on my feet alot, but wasn't working, and rested when I needed. Ultrasound showed nothing was wrong with bubs, cord, growth ect..... At 40 weeks bubs was only measuring at 34cm, and they still said tiny baby..... Though healthy. He was born 3 weeks ago and weighed 7lb 10oz!! Not sure where I was hiding him, as I was tiny, as I was with my first. I actually asked the midwife to weigh him again as I couldn't believe the weight after what the Drs were saying. Dont worry, Im sure everything will be fine, though if it makes you feel any better request one. Maybe if your GP thought it was neccessary he/she would do it. With both my children I was small, never showed till at least 20 - 24 weeks, and then didn't grow much! Good luck!