How fast did you get pregnant after DEPO. x

How fast did u get pregnant after depo? I was only on the depo for 3months and my period cycle is all over the place 43 day cycle I'm only 19 I have 1 child but can't seem to conceive my second :( I get a period every 43days ish but this month I have been bleeding on and off for most of the month my period isn't due till next week :/ tmi it's been brown or pink through out month I came off the depo august last year been off for 9 months help please !