First, call your OB. We can only give experience advice, rather then medical advice.
You've probably shed some water weight. (Bloating.) My sister looked pregnant at 6 weeks, due to all the bloating. Eventually, the bloating went away. Also, some people NEVER feel pregnant. I was pregnant at the same time as my friend and both of my sisters. Two of us felt pregnant from day one, until the day we delivered. Two never felt pregnant! Your womb is designed to fiercely protect your baby. It can take some serious blows and your baby will be safe and sound. All that fluid and cushion, is also there to adsorb pressure (hits, kicks, whatever), just as much as to give nutrition. Especially, right now. Your little is just a peanut, and there is all kinds of protection around it. Try not to worry!!