I found it!

One can generally start feeling the fundus (the top of the uterus) after 12 weeks. To find it, you basically just press around under your belly button until you feel a hard lump. It peeks out from your pubic bone around 12 weeks and is at your belly button by 20 weeks.

I've been trying to feel my fudus for weeks now, but since my uterus retroverted (tilted back) I hadn't been able to find it - until now!

It appears to be right where it should... perhaps a little higher, even! It went into hiding before I could let T.J. feel, but it was still exciting.