Well ladies, I really feel like it's a boy. Its head looks like my others and I just got a feeling. During the scan I didn't see any really obvious nub (and I was glued to that area!) but I have photos and I think there may be. In the best quality photo the spine is very curved but there was a tiny photo in the corner of another photo where the spine looked straight so I've zoomed in with my camera and then lightened it - but I'm afraid neither are very clear! The third photo is just for fun - he/she was waving at us!!
ETA : I'm putting the clearer versions of the pictures in, in case anyone new should want to take a guess!
http://i68.photobucket.com/albums/i3.../P10204962.jpg
http://i68.photobucket.com/albums/i3...y/P1020483.jpg
http://i68.photobucket.com/albums/i3...y/P1020482.jpg
http://i68.photobucket.com/albums/i3...y/P1020489.jpg
http://i68.photobucket.com/albums/i3...y/P1020495.jpg