At what point do you worry about movements?

Baby has been quieter the last couple days and when she does move its slower and not as strong

I'm not sure if this is a quiet week or if shes running out of room or if I should be concerned

Last app at ob she was happy healthy and measuring 1.5 weeks ahead
Only slightly bad things were my high sugar and placenta calcifying early

Could it be because I have had to cut down on sugar?

I've tried having a cold drink but that didn't do much