I had this with DD2 and was on watch from 28wks and told to pack my bags as apparently polyhydro babies can make an earlyu entrance, I was massivly huge the doctor said i was carrying the same as what a twin pregnancy would be carrying bellywise.
I was on weekly ultrasounds from 30 weeks.
We made it to 36 weeks and my daughter was born weighing in at 7lb 10oz