I don't think I have been ovulation for the past 7 months

Sophie • Ttc baby#2
I came off the depo injection August 14th 2013 . I have periods but they are irregular I was last on my p on 07/ February and havnt been on since :( I really want to concive but I don't think I can :'( I have unprotected sex with my fiancé all the time but nothing :(