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An ultrasonic wave is a sound wave vibrating at a frequency beyond the human hearing. The wave is emited from a devise (or an organ in the case of animals such as bats). The wave then hits an object and reflects of it (an echo). The devise (or another organ in the bat) will detect the reflect wave and measure its direction and the time it took to be reflected and the devise would use that information to produce an image.

It works pretty much like our ability to see. Light hits objects and is reflected off them and hits our eyes. An ultrasonic devise "sees with sound" waves instead of light waves.

During pregnancy, a devise omits an ultrasonic wave (you can't hear it!) The wave will hit many things in the stomach but the devise is programmed so that it only measures a specific distance (or time) which is to the fetus. The sound waves hit the fetus and bounce back.

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