is there such thing as normal weight gain

Thea
First off i am 5'10" tall with a large frame and slender build. I am just about 27 weeks and i so far i have gained 28 pounds. My doctor is not concerned whatsoever. 
     However today i called my grandma to see how she was doing. She asked me how my apointment was today. I told her my blood pressure was good and the baby's heartrate was good 😊. Then i told her that i have gained 28 lbs since ive been pregnant. She immediately and insensitivity said "OH THATS NOT GOOD". I replied with "really because my doctor said it was fine". I eat healthy. I walk the dogs everyday and i swim laps at the YMCA. Also when i am at home i do prenatal yoga and leg exsercises like squats, donkey kicks and leg lifts to build up my legs and butt to balance out my big baby bump! Muscles weigh more than fat. And my grandmas insensitive comment really rubbed me the wrong way. Sometimes im glad that i moved a few states away from all of them.