First pregnancy and I have a question..

So this is my first pregnancy. I'm 16 weeks and 4 days. What does it feel like when you feel baby's first movements? Or this quickening thing I keep hearing about? I've just felt this fluttering/kind of like a bubbly feeling on the right side. At first I thought I just may need to go to the bathroom or something...but no, not that kind of feeling lol.