thank you for your query.
cavitation is contraindicated in pregnancy
It can impair the hearing of a newborn.
Some studies show that it can impair the immune system of the fetus.
Right now, on ultrasound there would be no visible abnormality.
But you are right, the damage that COULD occur would be not visible.
Please consult a Genetic counsellor who would give you the odds of abnormalities that could happen.
Take regular folic acid