Idk how some women do it..

I'm 29w 4days & I've gained so much I got pregnant at my heaviest & im barely 5ft 🙂 I'm almost 170 which scares me so much!! I had an appointment today and in just maybe a week I gained 2 pounds I've been eating healthy I'm really hoping its my baby gaining weight and not me.. i see so many women who's baby bump grows but they don't I don't understand 🙁😡 I want to enjoy my pregnancy but I'm so scared I feel so big already 😞 I still have like 3 more months. Any tips?