ultra size wedding wear for full-figured brides

I want to ask i had ultrasound at 20+5 week..when i saw the baby on screen i could not see my boy genitels like penis or the balls..just the normal hands legs face head..is genetils easily seen on ultrasound or does it require to zoom or something..does that mean i will have a girl?? I did not ask the technician.. ultra size wedding wear for full-figured brides