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I think you'll probably put weight on at some stage unless you were quite a bit overweight to start with.
The fact is that skinny people generally put on more weight than overweight people.
I was overweight. Didn't put on any weight until very late in the pregnancy and ended up putting on 8kg in total, most of which was fluid. I know this because I lost 13kg in the week following the birth so ended up 5kg less than when I started.
The same seems to be happening in this pregnancy (although I was a normal BMI when I conceived). I've not put on anything so far and it would be lovely if that continued but realistically, it won't. My portions are much smaller than they used to be because I can't exercise so therefore don't need to eat big meals.
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I am 5' 8" and started my first pregnancy at 70 kg and lost about 5 kg after the 1st trimester. I only gained a few, maybe 6 kg by the end of the 2nd, and then gained about 22 kg in the 3rd. I wasn't doing anything different and I was walking regularly and not "letting myself go." I don't trust the weight-gain rates they put in all the books. I think you can tell if you're being reasonably healthy. My second pregnancy, I gained a lot less and also started out a lot lighter but I still had the same weight gain pattern as in the first with it all being in the 3rd trimester. Everyone's different I guess.