I have a story that is set in a specific (distant) historical period, and the detail of everyday life is as accurate as possible for that period. It is set on specific dates (so even the phase of the moon is correct - not that I'm obsessive!), and some of the characters are real historical characters, all of which suggest historic fiction. However, the narrator has the ability to see the future, and this is a major element in the way the plot develops. Visions of the future would not have seemed improbable to the people of the period, but to our 21st-century view, they are clearly impossible. Does this tip it over into fantasy?
Am I in danger of falling into a no-man's land between two genres?