I didn't feel movement until 21 weeks. Once he started kicking, he never stopped! The ultrasound tech said depending on the placement of the placenta, it could take some woman longer to feel anything. It was definitely nerve racking waiting though :)
Everyone is different. I started feeling movements during the 16th week, but my midwife said she doesn't expect women to feel anything until about week 20. So no worries. :) But when you do, it's literally the most amazing feeling in the world. :)