Depo shot for 5 years

So I’ve been on the depo shot for 5 years I’m 21 now I stop takin the shots mid 2017 when my fiancé An I decide we wanted to start a family we’ve been trying for 5 months goin on 6 we’ve been having sex everyday. I would’ve thought I’d be pregnant by now Or is it just because I’ve been on depo for 5 years ?