Was at a store and I went to the bathroom and noticed I was bleeding but I don't know if it's my period, it was very light bleeding and cramping till about 1200am and then it stopped, I have been on depo provera for 9 months and I was supposed to get my second one on the 20th of November but I didn't, I don't know what's going on. What is going on with my body, am I about to start my period?

It could be that you're about to start your period. Are you sexually active as well? It does take several months, up to a year in some cases, for all the depo to leave your system so it could be you retaking control of your reproductive system as the depo runs out.