What classifies as decreased fetal movement?

Lisa

I'm 27 weeks (+ few days) and feel like last week my baby's movements were constant and HARD (big kicks, etc). The past 48hrs they seem less so. I definitely still feel him throughout the day but its more gentle kicks and pokes. Should I be worried? Or not because there's def still movement.

Probably unrelated: I also haven't been feeling well - sore throat, headache, cough...

Any tips to calm the nerves appreciated.