17/18 weeks scan - boy or girl?

[Nephele]

Today we had our ultrasound, I'm at 17 weeks but the measurements said 18 weeks. I tried to look for three lines or a little penis on the potty shot, but could only see two lines? Anyway, we did not get any potty shots printed, so will upload a few profile shots instead. Please tell me what you think, and what you're basing it on (any method/theory is welcome).

Best skull picture;
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[lovemy4]

No clues.

[deaks66]

No clue but love the smiley face skull pic!

[Nephele]

No guesses? Skull or nub theory?
My first "hunch" was boy from day one, but these last few days I've been dreaming about it being a girl several times. So curious! Will try to book a gender scan in the summer.