Kick Monitoring

Currently 24w 4d with our baby girl. Due to having an anterior placenta and being on the larger side, I didn't feel her kick until 23 weeks (this is also my first baby) 
I can feel her kick really low down, but there's no routine?! People say I should get to know my baby's routine. Sometimes she kicks like crazy, sometimes she's very quiet. I am missing some movement due to the placenta, but I'm not sure when to start panicking if I don't feel her move?