I first started to feel 'movement' at around 17/18 weeks which felt like wind in my stomach (the only way I can think of describing it is as though your belly is trumping!). At 19/20 weeks the 'wind' changed to butterfly movements, and now at 23 weeks I can feel my little monkey kicking! He is sitting very low down as everytime he kicks I feel as though I need a wee but this sensation soon goes once he stops.
I've also noticed that when baby kicks and I put my hand to my tummy he immediatley stops and then starts again when I move my hand! He has already started playing games with mummy and daddy! uh oh!