Every woman is different. Even each pregnancy by the same woman is never the same. So don't worry too much. I heard that if you can feel movement at least 10 times a day, that's Ok. But also take note that some babies are most active at night and rest more during the day. So its also likely that you sleep through baby's active periods. If it bothers you too much, talk to your practitioner. Cheers
every pregnancy is different I started feeling my baby frequently move when i was 22 weeks. with my first pregnancy i started feeling movements frequently at 15 weeks