I know people have found this VERY hard to believe, but I started feeling movement from 13w!!! It was a bubbly sensation and I would feel it when I was lying in bed....not at any other time. I too thought it couldn't be that, that it was way too early, but as time progressed and I got more and more of that feeling I knew that it most definitely was our little one! Also, at my 14w visit to the OB, he asked me if I had felt movement yet and when I explained the sensation to him and said that it started a week earlier at 13w, he said that it was most definitely our baby!

So all in all, I think it is different for everybody and some people don't feel their babies for a very long time for a number of reasons such as how their are built and where the placenta is positioned, but some people can also feel movement really early like I did!