18 with my first son 15 with my 2nd son:)
18 weeks for me... now at almost 33 weeks, I can't keep his feet out of my ribs and they are very strong. Everyone is different and it also depends on placental placement.
I started feeling mine at 16-18 weeks, very small flutters, like gas bubbles and popcorn
This is my first baby, and at the end of 17 weeks, I felt quickening for the first time. Now I'm 20 weeks and it's gotten stronger and more frequent. Everyone is different though!