Why Am I Still Not Getting Pregnant After 2 Years Of Treatment With Letrol, Duphaston, Metformin, And HCG Injections?

i have married from last 4 yrs. at first i had high prolactin and then having medicine and its normal now.then from last 2 yrs i am trying to conceive.my doc suggest me to take letrol, duphaston,metroformin and revosit sachet.after my period just finished then from 10th day to 18th day i took dupashton. i did my tvs and my egg was mature so that i took hcg intjection to rupture it but till now im not pregnant. what should i do? and my husband and i have no medical complication.plz suggest.im feeling so bad that why i dont get pregnant yet .my age is 30 and my husband age is 34.