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The main criteria needed to get pregnant are:-
-normal and regular menstrual cycles;
-proper ovulation that is proper formation of follicle and rupture to release the egg
-patent fallopian tubes where pregnancy
-normal semen analysis
of your husband.
So you have to get investigated like do a ovulation study to find if there is proper formation of follicle and rupture to release the egg.Do a HSG
to see if the fallopian tubes are patent.See if you have normal cycles.And if everything is normal also get semen analysis of your husband done.Once you are investigated to find the cause then the cause can be treated and you can get pregnant.