Of course it might have been Germany that had the bomb.
Very unlikely. Germany had the best engineers, but the Nazis considered advanced physics to be "Jewish science," and just about all the leading ones defected to the USA. Of course, a goodly number of these were also providing information to the Soviets.
The Germans were many years away from developing a Bomb, and never really worked on it very hard, esentially abandoning the project in 1942.