Kick counts

How do you guys count accurate kicks towards the end I am 37 weeks pregnant and my doctor keeps telling me to watch for decreased movement and that if I feel less than six per hour to go get seen at L&D but for me she has never been that active so I don’t know how to tell when it’s less. I have never felt her all day long. It’s more she’ll sleep for like 5-6 hours and then wake up for an hour and kick like crazy and then nothing again for a few few hours so I have no way to engage what’s “less”? it never bothered me until my last check up when she told me a warning sign for labor was decreased movement and now it’s all I think about and stress about.