Little movement

Nana10

So I’m 15w 1d snd I’ve noticed a decrease in movement which I know is normal due to less space. My last dr appointment was virtual and they told me to start kick counting 10 kicks in 1 hours. Today I counted only 6 kicks in one hour and started over for a second hour it’s been 18 minutes so far and only have felt 2 kicks. I’ve ate a popsicle and drank cold water to get her moving but doesn’t seem to be working. When should I start to worry and think about taking a trip to L&D?