I had this too. I was told it was...I know this may be a little gross...but I was told it was poop and gas moving throughout your bowels. Your uterus is pushing on your organs and I know it may feel weird, but about 18-20 weeks is when you should start feeling the baby move, and even then it is like tickly, flutter movements. I'm 20 weeks, and i just felt my first movement sunday nigh.
The fetus is only 2 inches in 11 weeks it's impossible to feel it that early... It's probably something else..?