Ok here is my predicament...

I was on the shot for birth control off and on for the last 7 years...my most recent injection was august of 2005...and i could be wrong on that lol I cant remember anything....i know its been WELL over a year or so ago. anyway, i got my period back for several months and then it was just gone, and i never really thought about it, but its been several months, now i have children already and you would think that i would know if i were preggers or not...but i am just owndering if this is due to the injection back when or if i am just all screwy hehe. At any rate, any kind of information would be totally appreciated