Does anyone have or have you had Polyhydramnios with a past pregnancy (Too much amniotic fluid)

Last week I had a 29 week check and the Dr said I'm measuring 3 weeks ahead. So next week they are doing an additional ultrasound. The dr said it could be from the way I am carrying, or my due date is wrong, or I have too much amniotic fluid. I'm certain my due date is correct because I know the date of conception. So hopefully it is just the way I am carrying. I made the mistake of looking up too much amniotic fluid in pregnancy and it is technically called Polyhydramnios and it doesn't sound good at all for baby. Praying just the way I'm carrying the baby.