Which of the following is a typical sign of placenta previa?

In the context of placenta previa, bright red vaginal bleeding is a typical sign due to the position of the placenta obstructing the cervical opening. As the uterus expands and the cervix begins to thin in preparation for labor, this can lead to bleeding. The bright red color indicates fresh blood, which arises from the placental area rather than from other potential sources of bleeding during pregnancy, such as labor or complications like placental abruption.

The other symptoms, such as painful abdominal contractions, severe abdominal cramping, or loss of fetal movement, can occur in various pregnancy complications or normal labor but are not specifically indicative of placenta previa. Painful abdominal contractions are more characteristic of labor or other complications, while severe abdominal cramping can indicate issues such as ectopic pregnancy or miscarriage. Loss of fetal movement can be concerning and indicate fetal distress or other complications, but it is not a signature symptom of placenta previa.