That or I just really don't know how to use a doppler...
Last time I went for my OB appointment he put a doppler on me and said "There's your baby's heartbeat" I listened for a bit and said "No, I think that's me!" cause I could feel it myself and it was the same. He moved it around a bit more and then we could hear the baby which sounded a lot faster. I think around 150 bpm is about right for a baby? So anyone can get it wrong!!