it can takes quite a while for fertilty to return with the depo usually takes people up to a year.well it did for me. i would say you chances of being pregnant would be low. go on to this website which tells you this info . about.com:womens health. and type in depo provera .
I had one shot and its taken me 3 months just to have a AF. It depends on ur body but I'm sure u pry won't the chemicals stay in ur system for quit sometime!
You had sex 8 days after you were supposed to get your next one? If so, an it was unprotected, it is possible. Wait two weeks from the last time you had intercourse and take a test with irst morning urine. Since you don't want to be pregnant, you need to be using protection at all times.