I would say that with your history, your
OB would not be overly keen on you having a natural 3rd stage. For that matter they generally aren't keen on any women having a natural third stage, let alone those who have a history of hemmorrhaging or retained placenta. This is not to say you can't have what you want - it is up to you to decide what interventions you want during labour, no matter how much your doctor may protest, you do have to right to refusal. Just be prepared for your doc to be against the idea.