low placenta / marginal previa

Co
Found out at 20 weeks that I had low placenta. Did another ultrasound at 24 and again at 28 (today) and it's still low. Officially marginal previa. Doctor said we'll check up until I'm full term but to start emotionally preparing myself for a 39 week c section...
Anyone else in the same boat? Everyone assured me that this stubborn placenta would move but it's not budging! 😭