Girls, could you tell me if you had something like that where they first…

Girls, could you tell me if you had something like that where they first determined one gender for the baby and then another? They said it was likely a boy (he was lying awkwardly and the ultrasound technician caught something in general). Now I'm waiting for two screenings to confirm. It's not that I'm not happy with a boy, but I just want to know exactly who to prepare for.