Hello there, Polyhydramnios usually occurs with diabetes. Gestational diabetes do have a recurrence risk in subsequent pregnancies. So you need to be vigilant in this pregnancy regarding your blood sugar levels and weight gain. You need to take your glucose screening test in the first trimester itself. Repeat the test in every trimester as sometimes the sugars get deranged later in pregnancy. Keep a record of your weight gain. Incase you gain excess weight it can be due to diabetes or polyhydramnios. You should keep a balanced diet and avoid excess fatty and high carbohydrate foods. Take care.