I can only echo what the above posters have said, please don't buy a home doppler. They cause so much stress and worry, not to mention false reassurance if something is actually wrong. I totally agree that these should be banned for home sale!
Most trusts in the UK now have stopped listening for babies heartbeats at the 16 week appointment as it was so hit and miss. Even a fully trained and experienced midwife could struggle to find it and can you imagine the stress when they had difficulties?
Someone else mentioned the sound of the blood flow from the placenta. I've seen posts saying they're easy to distinguish....not true....i heard both in quick succession at one of my appointments and there's no way my untrained ear.could tell the difference.
I am also currently in hospital due to preeclampsia and am on the ctg monitor several times everyday listening to baby's heartbeat. It is different every single day.....i have learned so much about resting patterns, varying baselines, accelerations, decelerations etc that I had no clue about. Would you know what you were listening for sat at home? Could you identify an issue?
There have been cases of miscarriage and stillbirth linked to home dopplers where mums to be were sat at home and failed to seek medical help after being 'reassured' after hearing 'something' that wasn't the hb at all or indicated a problem that they weren't trained to recognise.