Sayang, amniotic fluid levels ni memang something yang kena monitor closely, especially kalau borderline. Since doc refer you, that means they want specialist to check properly, which is the right move. Go see the obstetrician as scheduled, ok? They'll do proper ultrasound dan beri guidance yang sesuai dengan condition you. I know it's worrying, but borderline cases boleh stable or improve dengan proper monitoring, a few of my mum friends went through similar situation. Jangan stress sangat dalam waiting period, try rest more and drink plenty of water. Keep the appointment with specialist, ya. Semoga everything okay!