How can I get pregnant?

Hi I am 21 years old me and my husband been have been trying to get pregnant for almost 2 years I was in depo provera for 10 months after that I got off the birth control and get to see the doctor he prescribe me a medication to start my period he said I would be able to get pregnant in 6 months well a 16 months have passed and nothing yet. I went to my ob/gyn he prescribe me the same medication to start my period and another medication called clomid 50mg on my 5-9 cycle day and been monitoring my basal body temperature well it's the 14 cycle day and my BBT is below 97.20F this past few days. I really want to get pregnant I been trying for so long, I need some advice.