m00,
For my case, during normal routine scan, i can't see gender cos bb legs close/blocking. Some mummies get to know gender as early as 16wks if baby is in a gd position during scan & willing to co-operate = open his/her legs.
Detailed scan aka Fetal Assessment will show the fetal measurement & anatomy of the baby's head, brain, spine, neck, vessels, abdominal wall, kidneys, bladder etc. My next gynae visit will be 4wks later.