Hi girls. I am slightly baffled, when i use my doppler (hi.bebe with lcd) It shows a heartrate of around 148-150bpm. But at my scan on monday the sonographer measured the HB at 164bpm.. I used to get that rate on my doppler a couple of weeks ago but it seems to of come down. Can the babies HB really change that much so quickly? I checked it monday night after my scan and it showed the 148-150bpm i know they say it depends if the baby is awake etc, but can it be that much different? or could it be my doppler isnt very accurate?