A 32-year-old pregnant woman, currently at 28 weeks of gestation, presents to the emergency department with painless, bright red vaginal bleeding. Upon obtaining her medical history, you learn that she was diagnosed with placenta previa earlier in her pregnancy. Based on these findings, what is the most appropriate initial management for this patient?
Administer a tocolytic agent to delay preterm labor.
Prepare equipment necessary for labor induction.
Conduct a manual pelvic examination to assess the extent of bleeding.
Administer supplementary oxygen and place the patient in a left lateral position.