frustrated

so I've been off depo since August of last year.. N been on n off the pill a couple times in the last year... I stopped taking my pills a couple months ago N have been havin my period twice a month for the last 3 months.. me N my boyfriend have decided to try n get pregnant! but it just doesn't seem to b happenin... I just want a baby 😞😞 can someone tell me y it would b so much trouble or take so long to get pregnant?? is it because of the depo?? if so how long does it take to get pregnant after u get off the depo??