How many times should i fell him move?

im 37 weeks pregnant and was asked by the midwife if i was felling the baby move, i said yes as i fell him move during the day he used to be more active during the night, but now he doesn't seem to be i hardly fell him at all of a night and was just starting to worry as i have been having weight loss issues with this pregnancy, and i wounder what it is i should do.