24 weeks, still no weight gain.

At what point will this become worrisome or be taken seriously? At every appointment my OB says it’s fine. But how can it really be fine, especially the further I keep getting? Something has to be wrong. Most people who are as far along as I am have gained at least 15 pounds by now. I don’t understand. No I didn’t lose weight in the first trimester. Like 3 pounds if that. I did gain that back, and that’s it.