weight gain 😓😓😓

So when I got pregnant I wasn't gaining any weight and remained 250 till I was about 21weeks and now I'm almost 31 weeks and gained almost 50 pounds 😓😓😓😓 I'm weighting 298 1/2 pounds... anyone gain weight like this? I also don't have GD so that's not it...my pregnancy is healthy just gaining tons of weight... first baby as well