I've gained 2.4kg and I am nearly 16 weeks.

Everyone is different and as long as you're not putting on loads then I think that you'll be fine.

A friend of mine (who gained 50kg when she was pregnant) told me that it was "perfectly normal to gain at least 30kg"!!!!! I was like um, I don't think so.
Her way of justifying her own weight gain I guess.

As long as you feel comfortable then I guess there is no right or wrong answer here.

Sue x