We had our 12wk scan at 13w1d and accidently saw what was most likely boy bits, very obvious and by 13wks apparently everything is formed and possibly seeable. We had a specialist tech though.

Im waiting for my 18wk u/s to confirm but Im pretty confident!

ETA - the tech checked out the abdomen and showed us the bladder and stomach etc but no ovaries were sighted, thats what they usually look for at that early stage to confirm or deny.