The best replacement for previa is estima.

The best alternatives to previa are rated as following:
★★★★★  estima
★★★★★  abruption
★★★★  placental abruption
★★★★  abruptio placenta
★★★  abruptio
★★★  alphard
★★  placenta abruption
★★  grandis
★★  low lying placenta
★  placenta previa
★  sharan
★  placenta abruptio
★  abruptio placentae
★  luxgen
★  placenta accreta
  of a placental abruption
  ford galaxy
  toyota sienna
  very low-lying placenta
  mitsubishi grandis
  anterior previa

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Speaking about previa, one probably shouldn't forget about accreta.

Other search terms related to previa and their ratings are:
★★★★★ accreta
★★★★★ no bleeding
★★★★ bleeding
★★★★ hemorrhage
★★★ twin pregnancy
★★★ anterior placenta
★★ brown discharge
★★ placenta accreta
★★ previous cesarean section
★ contractions
★ vasa previa
★ abruption
★ c section
★ abruptio placenta
★ spotting
★ bed rest
previous c-section
increta
multiple c-sections
pelvic pressure
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