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FJ, all of those shots look very boyish, but it is best to determine gender at that early stage with a profile shot, the angle of the protrusion is more accurate from a side view.
There is one of the 3D pics and it looks like the nub is pointing up (indicating boy), but 3D is not the best for determining baby's sex either.
xx
hmmm must study the ultrasound a bit more hehehehe. Im sure it is a boy though.