Thanks for your query.You are worried that you can not impregnate your wife even after trying for two months Conception is a very complex process and involves both the partners .First off all have you done your semen analysis
It is important to know the sperm count
,Motility of the sperms and morphology of the sperms.Your wife has also to get checked by Gynecologist to asses her fitness for pregnancy
,Please consult some urologist
to asses yourself after doing semen analysis.