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Hello, this is Dr. Jess. I am sorry to hear about your predicament! Yes, a cat could become pregnant at 7 months old unfortunately! Was the male on top of her only for a second? Has she been acting as though she is in heat? Here is info on signs of being in heat:
The most notable signs of estrus in cats are behavioral. Most cats become very affectionate, even demanding; they persistently rub against people or objects such as furniture, rubbing against their owners and constantly demanding attention. They roll on the floor. When stroked along the back or spine, they raise their rear quarters into the air and tread with the back legs. They also become very vocal. These behavior changes often become annoying to owners, and sometimes owners think their cat has some unusual illness.
Some female cats will urinate more frequently or may even spray urine on vertical objects ("marking") when they are in heat. The urine contains both pheromones and hormones, both of which act as signals of her reproductive status to other cats. This is the reason that queens in heat attract intact male cats. In some cases, this may be the first indication that a young cat has reached puberty.