Both pregnancies I have been totally flat at 17 weeks. With my first the bump didn't come till around 24/25 weeks, with this one it was around 21/22 weeks, but even then, my bumps were small. This one started sooner, but now at nearly 30 weeks, they're about the same size. I stayed small all the way through with my son, but he was 9lbs at birth. Baby size and bump size have little correlation if you ask me; it's all down to the torso length and abdominal tone of the mother. Here are shots taken when I was around 17 weeks in both pregnancies. First picture is my first pregnancy and second is this pregnancy.