FTM, not gaining weight?!

I’ve always been overweight, but nothing CRAZY. This is my first pregnancy and I’m getting really worried about my lack of weight gain, I was expecting to easily gain 20-30lbs based on what I’ve seen online.

My pre-pregnancy weight was 206lbs, at around 15 weeks I was down to 200lbs, and now at 25 weeks I’m at 207lbs.

I keep asking OB about it, and she keeps telling me as long as I’m getting the right amount of calories it’s fine, but this still seems wild to me!! What are others experiences with this?