From memory from my research (ahem ) the prenatal listening devices are just big microphones - whereas dopplers use u/s technology - hence that is why your says 21 weeks whereas dopplers usually say 12 - 14 weeks.
I think that is right - so bumping might just be your fluid moving around ???
) the prenatal listening devices are just big microphones - whereas dopplers use u/s technology - hence that is why your says 21 weeks whereas dopplers usually say 12 - 14 weeks.
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