Advice on doppler

Hayley • Dante 25.09.15 at 36 weeks Lillie 29.11.16 37weeks
If you don't feel baby move for a while but still find a hb on doppler my midwife said to still come in as going on the machine for 40 mins gives them a better idea of what's going on than an at home doppler doesn't let you know if the baby is in destress nothing bad happened on my part but was just a warning she gave me