Jess asked me to define a Sono Mock, so here it is, as best as I understand it.
An HSG (Hysterosalpingogram) is a procedure wherein they use a catheter to fill the uterus with dye and put you under an xray machine. They're trying to fill the uterus and push the dye through your tubes for it to spill out the other end. Meanwhile, the dye is exposing the shape, size and condition of the uterus, tubes and ovaries on the xray film.
The "sono" part of this procedure (sonohysterosalpingogram) is similar, though they use saline instead of dye and it doesn't need to go up in to my tubes since they're just checking out the uterus, looking for anything that might be complicating to a pregnancy.
The "mock transfer" part is where they use the same kind of catheter they'd use for the actual embryo transfer and they're measuring the uterus, investigating the wall and the shape, looking for the most favorable position to "aim" for during the transfer itself. During the actual procedure they don't "implant" the embryos directly in to the uterine wall. They just transfer them to the uterus, much like would happen if they dropped down in from the fallopian tubes in a good-old-fashioned conception. The doctors aim toward the position in the lining thought to be most favorable, but it's still up to God and the body's process for the embryos to actually "grab on" and implant. The mock cycle is done to give them the best chance we can provide from a mortal standpoint.
