Could a rough ultrasound tech caused the placental abruption? How hard does the abdominal trauma have to be?

NO. The baby is well protected in the uterus, with double shock absorbers of the amniotic fluid and the mom's abdominal wall. It takes a much more significant injury than a rough ultrasound tech to cause abruption.
No. The abdominal trauma doesn't have to be super severe, but an ultrasound examination definitely would not be enough. Hope this helps!

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