Not 100% on this one, but that's what midwives feel for when trying to establish how far gone you are... I know last time I was, I had problems rolling over in bed up to a couple of months as I think the top of my uterus was rubbing on the top of my pubic bone... not saying it is in this case, but have you done any pregnancy tests in this long period of no AF? Might not show up on a test now as the level of HCG gets lower the further along you get (I think, might be talking bollocks here) so a doc should be able to confirm - and a scan certainly would! I know of a lady who got to 4 months and was admitted for a scan re-infertilty and found out there was a baby in there!