To dream of an ultrasound test represents your wish to “just see what happens” without having to make any drastic changes. Being safe to not ruin your hopes for an opportunity. Waiting, gathering facts, or putting off decisions just to be safe. A safe or non-committal compromise. Testing something without making any serious or long-term decisions.
Alternatively, an ultrasound may reflect your wish to continue trying to conceive a baby to avoid disappointing other people. If you are considering giving up your attempt to have baby, the dream may be a sign that you are too concerned with disappointing your family above your own wishes.
Example: A woman dreamed of getting an ultrasound. In waking life she wanted to give up having a baby until college was over, but kept trying anyway so she wouldn’t disappoint her mother-in-law