No matter how hard I tried I put on 25 kilos both pregnancies (1 boy, 1 girl). I think alot of it is in your genetic makeup too, my mum put on the same amount of weight with both her pregnancies too.

As the others said, try not to weigh yourself. If you are concerned speak to your docter, but a kilo a week doesnt sound particularly high - it will slow down hopefully.

Good luck with your pregnancy.