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Is it a pulse, or is it high frequency sound waves? If it is high-frequency sound waves, you should be fine. Baby's ear bones aren't really developed until 18-20 weeks, I think, so you are on the edge of that (if you are due in early April). But even if baby can "hear," it can not hear the high frequency that rodents can.

If it is some kind of pulse thing, though, I don't have a clue!
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