30 week low amniotic fluid and other issues

Went for ultrasound today at doctors office for no fetal movement. They found I have low amniotic fluid and they saw small amount of fluid in fetal abdomen and near lungs. Heart beat was good at 135. I have to see specialist at 2:00 today for ultrasound. Can someone please shed some light on this situation? I did genetic testing and had my 20 week anatomy scan both came back great... I am so scared I’ll lose this baby