help I'm worried

Hi I'm just wondering is it normal to still have a almost flat stomach at almost 8wks pregnant?? I've always had good abs and have suffered with anorexia in the past (not for years) but have always been small I've gone from 40kg to 46kg in almost 8wks so many people I know have cute baby bumps already it worries me please help maybe post pictures of your small bumps to prove I have nothing to worry about and I'm not alone