Why isn't my stomach firm and bigger? Is something wrong with my pregnancy?

So I'm 11 wks pregnant and I am barley showing unless I'm standing or have just eaten. I gained about 5-6 lbs but my stomach is squishy when I sit and lay down. My have gotten fuller and the areolas are lighter then they were, but for some reason my stomach isn't showing really. I'm worried, my friends started to show when they were 11 wks but for some reason I haven't out grown any of my clothes! Should I be worried? Also my appetite has gone down as well, did something happen to the baby?