Baby moving?

Summer
I'm pretty sure I feel the baby moving. I'm 9 weeks based on my last period but doctor thinks I'm a week or two farther along. (Ultrasound is Sunday so I'll know exactly how far soon)
This is my second baby. I feel like a little pressure/fluttering/weird feeling. It's not gas I know that. It's not painful. It's interesting. Just wondering if it's possible to feel it so early. I guess it is. I could be 11 weeks along. 
How soon do you normally feel movement?