Which of the following statements about painless vaginal bleeding during the second-trimester stage of pregnancy is correct?
A:The presence of painless vaginal bleeding signals the immediate need for delivery of the fetus
B:Painless vaginal bleeding during the second trimester is typically benign and does not require further evaluation
C:All instances of vaginal bleeding in pregnancy necessitate immediate hospitalization for evaluation
D:Painless vaginal bleeding later in pregnancy may indicate cervical changes or placenta previa