I had this too. My tummy was HUGE! I was offered a procedure to reduce some of the fluid (but said no thanks!)

Mine was a side effect of having GD. I was told that it COULD mean the baby isnt "drinking" the fluid etc and that there could be problems there... As with Rae, it got a bit lower at the very end of my pregnancy... but i was still measuring something like 46w 38w!! (dont ask me how they figured that oue out!)

Im not really much help, abby was fine, it didnt hurt her in any way... i just was rather huge and it was a bit painful at times but i think most pregnent ladies are in pain by the end of it!!