This happens to me loads I'm 24 weeks, there is still a lot of room for baby to move around or could be facing the other way which would reduce movement. Apparently there is no need to be concerned so early as there is not a regular pattern. I wouldn't be too worried though:)x
wow, I'm impressed you've been feeling it so soon. With my first, I didn't feel my baby at all until 19 weeks. Have you tried the orange juice method of making a baby move?