Music Womb OR Stethoscope?

Jane
I'm debating getting the Music Womb to monitor and listen to the heartbeat at home. But, we're almost 20 weeks (currently 17+5) and I heard that at 20 you can hear the heartbeat through a stethoscope.
Just seeing what everyone else thinks and if the stethoscope really works to near the heartbeat, or if I should spring for the Womb Music or something similar.