Counting kicks confusion

Hey all!

My baby hardly kicks. I'm 25 weeks and this baby has hardly moved ever (same with my last baby and she was fine). I keep reading how important it is to count kicks, but this baby kicks like twice a day. At what point should I be concerned? I just saw a post how a baby had its cord around its neck twice and the mom just knew something was wrong, but how do you know if baby hardly moves to begin with? Baby is also super small and I tend to have big babies so I'm just super worried.