Gee, if a person was pregnant then that would show up and that would be made public.
I cannot believe that some people would think that this was anything other then poor choice, a security person who was not trained as a driver, losing control of a car due to inexperience and booze.
Also "IF" this was murder, I want the proof, where are the witnesses, all of them that can support the "well I was approached" to tamper with the breaks, I was approached and offered money to kill Diana.
If you somehow think that the "Royal" family could get away with this with no one on this planet during, what the third or forth inquiry into the death not coming forward, of even mentioning this "plan" to anyone, then I find that hard to believe.
A 19K Diamond ring, that someone else "picked" out for Diana is just not indicative of her social standing. This would have been a "trinket" or a friendship ring, not an "engagement" ring. Her engagement ring with Charles as worth 80K+ and she choose that ring out of many presented to her. That was when she was engaged.
So I do believe, at Diana was not pregnant, was not getting married, trusted Dodi with her life in the way of security and safety over and above her own security persons. She "entrusted" her life to a man she thought knew best. In the end, it did not work out well.
As for France, the hospital and medical system is not the same as in the USA. You cannot compare the two.