Yes, there is a chance. According to the Wikipedia, "The average return to fertility is 9 to 10 months after the last injection. By 18 months after the last injection, fertility is the same as that in former users of other contraceptive methods." This means that you're very close to the average amount of time, since 8 months have passed.
If you want to avoid pregnancy, make sure to use an alternate method of birth control!
Best regards,
Rachel Inbar
www.FertilityStories.com