Severe oligohydramnios 2nd tri - experiences and outcomes?

Looking for shared experiences and feedback. Here's my journey so far: - Normal 12 week scan and NIPT showed low risk. - 20 week anatomy scan, baby growth and functions appear normal, except for two minor markers which we were told are likely inconsequential. - Went for a follow up anatomy scan at 23 weeks to double check, immediately diagnosed with severe oligohydramnios (low amniotic fluid) with AFI at 1.8cm and admitted to hospital for bedrest. Ruled out a leak & PPROM. Baby appears normal, kidneys and bladder visible, blood flow/heart rate normal. - 24 week did steroid injection to jump start lung development, following 2x weekly scans showed no change in amniotic fluid - 26+5 week 3rd scan with fetal medicine specialist showed amniotic fluid increased, AFI now 7cm. Everyone (nurses, sonogrpaher, doctor) very surprised. I'm now resting at home, drinking a ton of fluids and waiting to reach the 28 week milestone - met with neonatal specialist and NICU staff to prepare for preemie birth. Doctor tells me baby will be delivered absolute latest 36 weeks by c section - if she stays in that long (1st pregnancy was emergency c sec, + other complications). Anyone experienced recovering from oligohydramnios? Fluctuating levels? Ever identified the cause or what helped? When we're babies born and how long was the NICU stint? Thank you