I'm definitely getting rounded in the tummy area. I'm 14+2 and lost 7lbs in the first 10 weeks due to nausea. I haven't put any of it back on.
The babycentre website has some good info. Basically if you were a normal weight (healthy BMI) pre pregnancy you should gain about 25 - 35lbs. If you were under weight its 3lbs more at each end of the scale and if you were a bit over weight then it's 10lb less at each end of the scale. Most of the weight should go on after 20 weeks so I wouldn't worry about it yet, especially if you are eating well. Baby is clearly growing if you're getting a bump.