Low amniotic fluid 36 weeks

Just had a BPP ultrasound due to IUGR. Baby got 8/8 which I’m so thrilled about but my amniotic fluid is low. The first time the tech measured it, it was 4 something. She then measured once again to double check and got 5.7. I am already being extra monitored because baby is measuring small and because of my history. Exactly a week ago at the BPP my fluid was 9.5. It seems like such a drastic drop. Makes me really nervous. I have a NST this Wednesday and again Friday but won’t get another BPP until Monday. My doctor said if my fluid drops below 5 then she will deliver baby. In the meantime she wants me to extra aware of movement and if anything seems off to

Come in for a NST. Anyone else going through this? Makes me so nervous.