BBC News Headline; says: 'Intimate details of Princess Diana's life will be heard at the inquest into her death, but whether she was pregnant may never be known, the coroner said. Lord Justice Scott Baker said it was likely "pregnancy is a matter that cannot be proved one way or the other in scientific terms in this case".
The inquest also heard how members of MI6 were in Paris during the summer Diana and Dodi Al Fayed both died. But they had "bigger fish to fry" than tracking Diana, the coroner said.
Lord Justice Baker also said there was evidence the princess had been using the contraceptive pill.
Diana and Mr Al Fayed died as a result of a car crash in a Paris tunnel on 31 August, 1997, along with their driver Henri Paul.
As Mr Al Fayed's father Mohamed maintains that the pair were killed to stop them marrying, the issue of pregnancy is one of 20 to be addressed by the inquest in London.
Lord Justice Baker said it was relevant. "First, her pregnancy or suspected pregnancy is said to have provided the motive or part of the motive for killing Diana," he said. "Second, her body was embalmed by the French and it is said that the purpose of this was to conceal that she was pregnant."
The coroner added that no pregnancy test was carried out on Diana at the Paris hospital where she was taken after the accident as there appeared to be no reason to do so.