The girls had something like this: at week 6 of pregnancy they saw one…

The girls had something like this: at week 6 of pregnancy they saw one embryo clearly, listened to its heartbeat, found also hematoma and cyst (ultrasound was done transabdominally), and at the first screening at week 12 they already saw two babies? Is it possible to confuse with hematoma? The ultrasound technician said that it is possible precisely this happened.