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No, ultrasound of pregnant woman has been done since 1980, and no scientific studies to this day have shown that ultrasound has a negative effect on the development of the fetus.

Ultrasounds are soundwaves in a high frequency (2-12 Mhz), which is a frequency that we are unable to hear. During a 3D scan, you may hear and feel a rotating sound from the transducer, this is from the engine that is inside of the transducer, which spins around to spread the sound waves in the abdomen.

It is neither dangerous nor hurt to have an ultrasound scan, though there may be some women who might feel a slight soreness around the abdominal area after the scan. This is because the sonographer or doctor might have to press a bit hard on the abdomen to get a good picture of the baby. The soreness will disappear quickly and is not dangerous for the mother or for the child in any way.