I put on 9kg's with both of my pg's. With my first I didn't dtart to stack it on til about 16wks, then it came at about a kg a month til the 3rd tri when it was more like 1 kg a fortnight. I wouldn't be worried yet.
With my first bub I didn't feel it move til I was about 17wks pg, so I wouldn't really worry about not feeling bubs move yet either. Good luck and I wish you a happy and healthy pg!