A 23 year old woman with painless vaginal bleeding at 36 weeks pregnancy otherwise seems to be normal. What should be done as next step?

The key is A. Vaginal US.[Painless vaginal bleeding at 36 weeks indicates the diagnosis of placenta

previa, which can be better evaluated by vaginal US. Previously any vaginal procedure was not done in suspected placenta previa which has no longer found harmful now like vaginal ultrasound even in

advanced pregnancy].