I don't remember the exact week - I was around 16 weeks along. I felt flutters for so long, that they all blend together. The heavier kicks have started recently.
I remember I was about 20 weeks pregnant with my first when I felt his first decisive kick when DH and I were hanging out at home - I screamed, I was so excited to tell my husband and I must have terrified the poor baby because he didn't kick again for hours lol!