Breech?

How does that work?
I've been told for about a month now that the baby is in the right position. When I went for my check up on Wednesday the baby had turned around so it's head was hitting my rib cage.
Today, not on my ribs, where is he?
Anyway, I now have a scheduled ultrasound to see the position; which is a little exciting because we didn't get any photos last time, so now we will, hopefully. It'd be nice to confirm the 'it's a boy' thing at this point too.
Also, I'm measuring just a little small, does that mean I could have a small baby??
Here's hoping!