I'am 22 ,

i have been off the depo injection since july 2012 i've not got onto any other contraception at the moment as my periods have been up the wall every 2 weeks and really heavy recently this mounth i never came on until 3 and half weeks after my other period so they are becoming more regular but this period only lasted 2 days when normally it would last a week i was heavy for one day then just light now its stopped so am wondering would this mean they are going to become more regular and i have a better chance of concieving or was that even a proper peroid because my period only lasted 2 days and it normally last a week so confused !!! :-(