big baby?

I had another midwife appointment today - but it wasn't with my midwife. It was with the intern. She's great, though. She's in her last year of midwifery so she's done at least a couple internships already.
So we chatted away, she told me some stuff about some disease I can get tested for and then we did the usual - blood pressure, feeling the baby's position, measuring the growth and listening for the heartbeat.
But this time when she measured the growth of the baby (from top of the pubic bone to top of the baby - usually just under the rib cage) she was shocked at how much he had grown since the last appointment. So much so that she went off to find a second opinion. When she couldn't find my usual midwife she had to get another one (who was just as lovely and nice as my usual midwives) who measured and confirmed that I had indeed grown quite a bit in 2 weeks. She also said I have a nice belly. :)
So my last appointment I measured at 31.5 cm and this time I was 37 cm. Which apparently is a lot.
So as of right now I don't really know what this means.
He either:
a) had a huge growth spurt and probably won't grow by heaps from now until my next appointment
b) is being pushed up by the placenta causing him to - uh...I don't know exactly. But something to do with my placenta
c) will be a big baby (please no...8 lbs or less!)
d) could possibly be due earlier?

So...I have an ultrasound next week so they'll check that out and find out what the situation is.

Other than that, I think everything is same old, same old.
I can't wait until we move into our new place so I can get this baby's room all set up!