What Causes Delayed Periods After Stopping Birth Control Pill?

hi it's been 35 days since my last period i been off the birth controle shot since september 2008(date of last shot) since i got off the shot i been haveing irregular periods i had two periods in april one starting april 5,2010 and the other april 29,2010 i had no period in may but i ws not pregnant and i had a period nun2,2010 that ended june 7,2010 am i pregnant or am i just haveing a late period