25 weeks and gained 30 lbs?!?

You guys.. I weighed 135 before pregnancy and ive never seen the scale go past 140. Today at my weigh in at 25 weeks pregnant i looked at the scale and saw 164. My doctor dismissed it saying there’s probably something wrong with the scale. I dont know whether to laugh or cry, is this normal? I have 3 more months to go, is this going to continue at the same rate? Will my baby be a pumpkin? I passed my GD test today