Do you believe that ultrasound scans - are dangerous for the baby?

Hello moms, I bought a bioimpedance scale. After I weighed, I was worried about the “electric current” that passes through the body to give so much information. I managed to talk to a nurse and she said that the current is like an ultrasound, it shouldn't be done often. I live in Germany and looking for my nurse midwife and doula I discovered that many nurses here are against the use of ultrasound scanning because it is dangerous for the formation of the baby, I even read an article, but it was not referenced much @Ultrasound Scans- Cause for Concern - Dr Sarah J. Buckley 2005. “Do you believe ultrasound scans are safe? or irrational fear?