Kinda confused about movements.

tmp-9226098

I have the my pregnancy babycenter app and it has the baby movement tracker thing where it sees how long it takes for the baby to move ten times and it says if there's a big change to call the dr. And that's where I'm lost because there are some days where she is just lazy and doesn't move much. What kind of change am I looking for? I just did it and dang, it took 22 minutes for 10 movements lol. I thought she was active til I started the tracker and she just stopped lol