When will I start showing?

I'm super tiny, 105lbs (just a high metabolism), and about 8 weeks now. I already feel like I can feel a difference in my lower tummy, it's harder and slightly poked out (probably just bloating) but have been wondering.. Will I be able to see my belly grow sooner than normal? Since I have no symptoms other than sore breasts I'm anxious for this, maybe I'll be able to actually feel pregnant ;) People who have experienced or know someone who has only please~