Depo injection how long did it take to concieve after coming off injection?

Was on the injection for four and half years hubby is in forces so is away a lot so after my last injection in March 2013 we decided to stop and ttc. Periods never came back after four months so went on the pill in nov 2013 to try kick start my period if that makes sense. Stopped pill in jan 2014 and period been quite regular till last month where had spotting but my cycle was 40days!!! How long does it normally take for cycle to sort itself out! We desperately want a baby but not sure how long it will take advice please sorry for rambling!! Any advie would be great!! Xx