Started feeling quickening at 16 weeks. Now I'm 18 weeks. When do you actually feel kicking the first time?

I felt mine at 19 weeks. It was weird b/c just the day before I was complaining how I didn't know how to tell if I felt quickening or not, then the next day he gave me a shot to the bladder. There was no mistaking it. Like somebody was flicking a nerve or pressure point.