I was the same way around 26 weeks & even now at 32 I've been the same weigh for about 5 weeks now but doctor doesn't seem worried I have to force myself to eat as long as you eat little snacks baby will be fine :)
I started feeling like this around 34/35 weeks and I'm still like that at 38 weeks. I've lost some pounds but my Dr isn't worried about it. I feel terrible but when I eat I can only take 2/3 bites before I wanna throw up because I'm in so much pain (back pain with contractions) and it *****! But I guessing its more normal.
I'm 25 weeks and I'm like that, I know it's not super healthy but so far my little one has been fine and growing good, I just stay so busy I literally forget eat some times