Obese and pregnant

I am what is consider obese by the charts. I started pregnancy at 221, 5’8 height. But went down to 212 due to vomiting and all of the day sickness, Around week 14-16 went up to 217, now i am 28 weeks and still 217, i am 7 months pregnant and not gaining weight, is that normal? Im just a little concern with the baby, or am not sure. With my first i was 13 years younger than now, then i was not obese, and i gained 35, lost them all after birth, but this one, idk if it’s because i am obese now or i have no idea, but my weight is been the same since i am 4 months or so.