i did ultrasound at St Teresa yesterday too, i was 14w6d and only can see the black & white 2D but the doctor showed us there is another line besides the cord so it should be a boy too!
honestly i didnt see that clearly but i have to trust the expertise of the doctor!
many people thought it was boy but turned out to be a gal because of the cord.
so when the doc told us it's a boy, i asked is that a cord? she showed me the cord (longer line) and besides there is another white line...