Not sure you'll be able to last until 16 weeks. People started congratulating me when I was just 10 weeks - it was all rather difficult as I didn't want to tell anyone until I was at least 12 weeks. However, mine were IVF twins and I had mild OHSS which made me very bloated at the start of the pregnancy and then I just got bigger and bigger very quickly.
Congrats goldenoldie, I've got 6 week old twins, and still getting used to the fact there are two of them! I was also very sick at the beginning, but although I did get a bump quite early it was compact until about 5 months - I was still in jeans, and so could conceal it. Then it just ballooned overnight, and gave me terrible stretchmarks!