With my daughter, I was well over 20 weeks before I experienced any movement. With this one, I started feeling the 'flicking' around 14 weeks. By week 16 it had progressed to what I can only describe as what felt like the baby 'shivering'! Since 19/20 weeks (I'm now 23 weeks), baby has been wiggling, thumping, kicking, squirming and rolling all over the place! I feel movements all day and night! You can feel and see my belly contorting as he/she moves around in there! At my 20 week scan, baby actually kicked the ultrasound probe off! Lol!
To be honest though, if I hadn't already had a child, I doubt I would have recognised those early movements as movements. I would probably have thought I had gas! If you are feeling baby, the movements will get stronger and more identifiable over the next couple of weeks!