Seriously---as long as your doctor confirms that everything is okay, don't worry!!! Consider yourself lucky that you will only have to deal with the big belly for a shorter amount of time than others. Smile!!!
Were you underweight before you concieved?You sound totally normal to me.Your tiny little bundle of joy only weighs about 1 lb. Right now and is about 12 inch. Long so don't worry if you aren't showing as much as other women. Most women won't start gaining the weight until the later months of pregnancy.