I'm coming up to 22 weeks with my first and it feels like the world and his wife is asking me if I've felt the baby move yet. Honestly? I have no idea! The whole 'bubbly, fluttery' description isn't helping. To be that just sounds like the sort of gurgly feeling you get around your belly as wind and food move around! I'm not really sure how to distinguish the two 
I'm not worried as such - the 20 week scan was all good and the baby was flipping around in there like an acrobat. The sonographer (who was lovely) actually said 'You'll certainly be able to feel this one moving round soon'. I feel like I get some slightly pitying looks when I tell people I'm not sure, which in turn makes me feel like I'm doing pregnancy 'wrong' because I'm not all in tune with my body...
I assume at some point the movements will definitely feel like something more distinctive and 'baby like'. Any idea when that starts?I'm actually just starting to nod along when people ask me now because I'm fed up with people asking!