My first pregnancy in the US - Neither my ob/gyn nor my midwife ever set up any kind of limit on weight - in fact, they just weighed me and never even mentioned it. Ever. Actually, I had a nurse just tell me, "You are just looking great!" as she was weighing me in. It was so reassuring and WONDERFUL. My midwife also just said, right at the beginning of care, "We are not going to worry about weight gain. You'll be fine." And I don't think we ever talked about it again. Very freeing!
My second pregnancy in China - mega focus on weight! Really strange - I had a doc comment when I came in to start care that, he, "couldn't believe I already had a child because I was in such great shape." - But then when I told him I'd already gained 5 pounds at 9 weeks, he changed his tune FAST. He lectured me about gaining NO MORE than 20 pounds altogether - any more than that would be very difficult to lose. I told him I had gained 30 the first time I was pregnant and had lost it all without much ado, and he just said I got lucky. It was annoying. Then, every time I would come in, he would comment about how BIG I was getting. "Well, I'm pregnant - I believe this is what's supposed to be happening!" I eventually discontinued care and went to another doc. But really, docs here are much more focused on weight, so now I just tend to avoid them full stop ;).