I had this with my first and looks like I'll have it this time too. I was measuring 9 weeks ahead, mainly fluid. Had heaps of ultrasounds, GD tests (excess fluid is a sign of GD) and was told big baby and excess fluid, nothing was wrong, would have to wait it out. My waters broke spontaneously at 36 weeks and boy oh boy, did I have some fluid! I also had an 8lb 2oz baby, almost 4 weeks early! This time I was already measuring 1.5 weeks ahead at 12 weeks and honestl, at almost 19 weeks I am enormous! Will see what is happening at 20 weeks I guess!!

Good luck but don't stress