First baby -no real bump at 11 weeks...

Hello all!
I assume this might be because it's my first, but I don't see much of a bump at all and I'm 11 weeks today. In fact, I have lost a little weight since my ultrasound 2 weeks ago. 
Is this normal? Any idea when I'll start showing more?
I just see a lot of others on here with much larger bumps at 11 and I get a little concerned.