How often should I be feeling my baby move at 26 weeks?

I feel her move here and there throughout the day, but there are times where I can sit and watch a show for a couple of hours and not feel her move at all. I know she's still OK in there though, because I have a handheld fetal Doppler. Sometimes if I listen to her heartbeat I can also hear her moving in there without feeling it. I'm just wondering if it will get more consistent?