You are carrying 28 wks pregnancy
and feeling with less/weak baby movement.
Actually baby moves in specific time/situation and you have to feel it properly. You can assess it by DFMC or Daily Fetal Movement
Count which is 10 per hr.
If you feel less than 10 moves/hr for 1-2 days or more,you need to consult with your doctor for clinical assessment along with USG lower abdomen for FPP.
Take healthy diet,continue Iron/Calcium supplements
, sleep properly with left lateral position and do periodic check up.