Based on several questions I've gotten about my swallowing comment, here's my current understanding:
Babies definitely pee in the womb, but most of their nutrients (and oxygen) come straight from the umbilical cord. Babies do begin to swallow some of the amniotic fluid at a certain point in development, but the lungs also produce their own fluid and push it out to prevent the amniotic fluid from filing the lungs since they (and maybe the epiglottis) aren't yet developed enough to block the fluid form entering the lungs.
Side note: when they do swallow, it is amniotic fluid. When they pee, it is also into the amniotic fluid. However, the pee if filtered by the mother's body through the placenta so the baby isn't drinking its pee. And, when a fetus is near term, it actually swallows about half the volume of amniotic fluid each day!
Also, for those who asked: Corey doesn't want to find out the sex, so I'm trying to keep my control freakishness under control and play along. So, we probably won't find out until the birth. For now, I'm called the baby
Corey Jr. because (1) Corey can be a gender-neutral name, (2) I hate called it 'it,' and (3) because the ultrasound technician said that the babies arms are back behind its head like it's just lounging around and relaxing - anyone who knows Corey knows that is just his style! :)