Confused/worried

India
Like two years ago I had gotten the depo shot I only had it for three months then never went back for the second shot . I've been trying to get pregnant ever since me and my bf been having sex since August unprotected, is something wrong with me ? Bc before I got with my bf in August I was messing with my ex in March and didn't get pregnant either , could something be wrong with me ? I haven't taken any birth control since November 2014 . And I had two different partners and still no luck 😢😥 someone help !