We have had ALOT of scans too! 7 weeks, 11 weeks, 14 weeksx2, 20weeks, 23 weeks, 24 weeks x3, 28 weeks, 32 weeks and still managed not to find out. I think its partially that after a while there is just not a lot of room to see what's going on but it did take a bit of will power at the crucial stages. It helps that we are both very bad at telling what is what!
They showed us the babies when they put them back as tiny wee embryo's, under the microscope via an internal video screen (about 116 cells
) and its really nice to have a bit of mystery after a little bit too much illumination if you know what I mean!