low fluid?

Lia
I went and had my 6 + 5 ultrasound yesterday and the doctor wants me to go have fetal imaging done due to low fluid. Everything I read on the Internet is horrible and is geared more towards the third trimester. I've read that being dehydrated can cause low fluid as right now all fluid is provided by mom until baby grows to provide it through urination. I took the day off to drink water all day. Any tips? Prayers would be awesome. Trying to stay strong and positive for my rainbow baby.