Help. Comment plz.

Help!! What are some ways to get pregnant?! Me and my fiancé have been together almost 4 years & we've been trying and nothing has happened yet.. I was on the DEPO shot for almost 2 years, but been off of it since last September. My periods have been super wacky! but I'm not gonna stop trying til I become pregnant! So any tips on how to become pregnant faster or anything!??