Experience gaining 10lbs total?

Does anyone have experience gaining only about 10 pounds total during your pregnancy? Did it feel like your body was somehow smaller even though your stomach was bigger? My doctor wants me to keep weight gain between 11-15 pounds because I'm obese. I'm 22 weeks and have gained 5, so I'm on track. I'm starting to notice it feels like my arms and legs somehow feel thinner but there is no way for me to judge, I obviously haven't been measuring. My first pregnancy I gained 50 pounds so this experience is very new to me. Baby is completely healthy and actually measuring in the 75th percentile size-wise, doctor is pleased.