Weight gain🤰🏻

Just curious how much weight others have put on by 20 weeks? I don’t really know what is normal at this point. I’m tall and have always been thin I guess you could say but I’ve never seen my weight up this high on the scale. I want to shut my eyes every time they weigh me😄 they tell me baby weighs 12 oz so where the heck do these 12 pounds come from lol😳 (obviously I know you gain weight during pregnancy I’m fully prepared and ok with it!) would just like to know how much I should be putting on.