Heart beat and baby’s location?

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So I saw my OB Thursday for contractions. She was listening to his heart beat with the Doppler and was so low on my belly. She said she thinks he might be head down now, and she pressed lightly on my stomach up top and said it didn’t feel hard like a head anymore. Anyone experience this? I heard someone say that if the heartbeat is below the belly button they’re usually head down and if it’s higher up it’s usually head up.