Gotta love that first trimester baby bloat. The only possibility of you showing is if you have a "tilted uterus". Even then, you wouldn't show til 8-10ish weeks. Enjoy being tiny while you can, you'll have a big ol' bump in no time. Also, congrats!
With that sudden burst of hormones, your body starts slowing down your digestion and, at least for me, I always looked like I had just finished a huge Thanksgiving meal - lol
I thought the same thing. It is just gas and fluid. In the morning I look normal but after breakfast it starts growing.