Hun I wouldn't be too worried about the weight gain it varies from person to person and from pregnancy to pregnancy.

I have only gained about 4kg so far but I look biggish for 19 weeks, I personally also retain a lot of fluid despite my best water drinking efforts. I think you are lucky to be doing so much exercise and I am sure it will help bring everything back down once your baby is here.

Don't feel bad or compare yourself to others, your body is acting the way your body should and you can always lose the weight after bub comes, just keep doing what your doing and stop stepping on the scales

Nae x