Weight and pregnancy

I am 31 weeks and weighed 128 before pregnancy. I went for a checkup today and I now weigh 167. I can’t believe I weigh that number it’s crazy. The doctor said my weight is good I don’t indulge that much in pregnancy, I exercise as much as I can. And I eat fruits and veggies at least every day. I didn’t gain weight in my face or arms but just my stomach, butt and boobs. I am shocked but not concerned as the doctor hasn’t said anything. I’m just kind of shocked