I always obsessed about my weight whilst pregnant, even though I knew I shouldn't, so I know where you are coming from. I'd try not to worry about the 3kg. I don't know about you, but my weight seems to fluctuate by a kg or so from one day to the next, so you might not have actually put on 3kg IYKWIM? And if you have, don't worry, 3kg in 10 weeks is awesome! I know that personally I put on 6-7kg by the time I was about half-way. I was actually really worried as I knew that the baby had most of it's growing still yet to do. I think my body just did all it's growing in the first half of the pregnancy as I only ended up putting on 10 (and was 7kg lighter when I arrived home from the hospital).