Weight gain

Ti

So I’m 29 weeks and started pregnancy at 254. Due to insurance complications my last doctor visit was at 13 weeks or so and I was 254 well today I weighed only 255.5 . I’ve been eating relatively healthy only eat junk maybe once or twice a month so that may be why the little weight gain. Does anyone else have experience with not gaining weight? I know since I’m already overweight I shouldn’t be gaining a lot but only 1 pound doesn’t seem right.