Ideally pregnant ladies start feeling around 19-24 weeks. But if it's your first pregnancy than you might feel bit later. According to the baby growth initially the movements are not that intense and you feel occasionally. Those gentle fluttering feelings in your tummy (quickening) are your baby's movements.
But if you had a baby before than you might feel as early around 13-16 weeks.
But if you didn't feel till 24 weeks do check with your doctor. She will check baby heartbeat.