High fluid

Kr

So I had a Stillbirth at 40 weeks a year ago and here I am 35 weeks and the dr told me today my fluid level is on the high side of normal but it’s nothing to worry about. Well I get home and of course I’m worrying. I’ve read that high fluid levels can cause Stillbirth. Why is this? What makes it cause stillbirths? Please any knowledge would be greatful.