Hi Lily
Try not to worry. From 10 to 18 weeks I had no change in weight. I'm sure I lost a bit in first trimester too even though I was well for most of it - i think its just your body gearing up another level to grow bub. Even now at 25 weeks I would be surprised if I've put on any more than 1-2 kgs tops - all my clothes fit me everywhere but my growing belly. I'm not into weighing myself because its not really my thing (never owned scales in my life) and I don't think its a helpful indicator of how bub is growing - your fundal height is best for that (i.e.when the midwife measures your uterus).

I've had lots of people comment to me that I look thinner than i did pre-pregnancy - i want to slap them all around the head, but have just learnt to ignore them. I think its cos you start to grow out front everything looks a little different.

Enjoy your pregnancy...take care
x