With my first they constantly told me i was small. However, Ethan was born 3 weeks early weighing 6p11oz, so he was a good weight. I am preggers with our 2nd bubs and had my appointment yesterday, and once again I am measuring small. Some of us just don't show. My mum was the same, even was told she was small with my brother who was a HUGE baby. So don't stress!!! One other thing I would like to add, is that my son, who is know three, is the tallest in his day care & one of the youngest there. people always assume that he his 5 yrs old. So even though I carried small, he arrived a healthy weight and his now a BIG healthy boy.