Hello, great question, my brain is ticking over.

I personally reckon that by the time the fundus gets big enough to start protruding over the pubic bone - ie your tummy actually starts to show - the fallopian tubes and ovaries are probably near the sides and possibly starting to be tucked behind the expanding uterus. Cos your cervix doesn't go anywhere, does it? I'm thinking of a loaf of bread expanding as it cooks, the bottom part doesn't really move (it's stuck inside the pan) but the top part where there's room goes crazy and puffs out all over. The pelvis must surely hold the ovaries in...?

Someone who has their ultrasound pickies might be able to have a look and tell us?
:-)
Ingrid