Yeah, I agree that if you are eating mostly healthful foods and not overeating but the weight still feels like it is piling on, then you just have to trust your body and know that it is doing what it has to do to sustain a healthy pregnancy (and help establish a healthy breastfeeding relationship down the road--maternal fat stores are crucial for that!)
Personally, over eating was an issue for me with my last pregnancy. So this time I have tried to remind myself that I really only need 300 extra calories a day during pregnancy. With the last one I DEFINITELY took advantage of my pregnancy as an excuse to over eat healthy things AND THEN also indulged in pie and ice cream at least 1-3 times a week. Even when I was making healthy choices (which I didn't always do that time) I didn't really pay attention to HOW MUCH I was shoveling in. And I know that I got to the point of regularly eating just a little bit past satiated (at least, until I was so large with child that a full meal was uncomfortable. But even then I think I ate more than I needed to, just in smaller but more frequent amounts.)
Before I got pregnant this time--as a non-pregnant runner who was breastfeeding a toddler--I think I mostly kept my daily caloric intake to around 2000-2200/day and I was very happy with my weight (I'm 5'2" and weighed between 115 and 117, but I've always been heavier on the scale than I look because I carry muscle mass in my legs from my days as a gymnast, and also from the running.) This is me just before I got pregnant, a little gun show for you ladies (yes I am aware that I have no guns to speak of) ;)
So now that I'm pregnant and running and (sort of?) nursing a toddler I'm trying to keep it between 2300 and 2500 for the day. Probably nearer to the lower end of that range because even though DD is still nursing, I don't think I am still producing any milk. And I most certainly don't count calories every day, or even most days, but I do tend to eat a lot of the same things (creature of habit) and know roughly what their calorie content is, so some day I'll just try to do a rough inventory of what I've eaten for the day and then I guesstimate the total calories. This time I have been doing a much better job of keeping my eating within a healthy range and I have gained only HALF of what I had gained at this point with DD.
But, all of that said, my point is that if you are eating healthful foods and not going way over what your daily caloric intake should be (and I doubt that you are, Tenk. From your description of your diet I'd say it would be tough to get in enough food to go over your range.) then I think you should really just try to trust your body. And don't worry--the weight jumps won't happen EVERY week. Last time when I had a big jump it was usually followed by a week of little to no gain.