Good question. At our NT scan she didnt focus on gender but I thought I would have seen something that looked like a penis. She said she couldnt tell. I go next week for a private gender scan. I will be 16weeks and 3 days. They told me they can tell then. They start there gender scans after 15 weeks. My OB doesnt do hers until 21. She said you can tell before than, but likes to wait until 21 weeks to check all the organs. I hope we both get our boys!!!!