Have faith. It may be chromosomally normally and a temporary condition However, it will require more surveillance by ultrasound, including a fetal echocardiogram and continued scans into the 3rd trimester. I would ask about screening for "cell-free fetal DNA" from your blood. It could be Turners syndrome and a blood test from you can evaluate for that. Remember, it depends on the severity of the fluid collection. Have faith and hope and seek the care of a high risk OB also called a perinatologist or maternal-fetal-medicine doc. Can be just a collection of fluid that will resolve in time. For piece of mind, get the blood draw. Noninvasive to baby. Sorry to sound so technical. Hoping for you.