hi, I just wanted to let you know I had exactly the same thing going on late last year in the last few weeks of my pgcy.
from about 34wks onwards, my belly, arms,legs,hands and face ( I had mick jagger lips!!) just ballooned!
i was measuring 42wks at 34wks (around the belly) i ended up being monitored for 5 hrs on a ctg (baby was fine) blood pressure was fine and trace protein in urine.
I had to have my blood pressure taken every week by the gp inbetween hospital visits.
I was on strict orders to take myself to emergency if visiopn was blurry or increasing headache.
by 39wks, I had no ankles or knees, just treestumps! big pouches of fluid under my eyes and fish lips. i also couldnt make a fist due to my fingers being like sausages, also the only shoes I had to wear were a size 11 mens pair of crocs, (i am usually a size 8!!)
anyway, everything was all normal, my baby was fine, i understand your worry though, everything I had pointed to pre eclampsia but it never eventuated.
hope you dont end up as big as I was, I put on over 30kg (I am sure it was all fluid!!)
and I hope you have an uneventful rest of your pregnancy. xxx