This happened to me. I was sure that my Edd was 29th Jan, dating scan said 9 feb, nt scan said 28 Jan, 20 week scan said 29 Jan and 36 week scan for GD said mid Jan but they still insisted that 9 feb was the one we would go with. I was kinda happy because it meant I got longer before they would induce me. In the end though dd1 came four weeks early (almost six weeks early going by their dates!) so she fooled the lot of us (I still know that my LMP was the right date though). In the end bub will come when she wants to. The waiting is a killer though x Good luck x