welcome to HealthcareMagic
canbe due to hormonal imbalance;anaemia;polycystic ovaries;thyroid problems etc.In your case the doctor has prescribed Amree plus which is a medicine used to reduce blood sugar and in your case she has given you for PCOD that is cyst in ovaries .The treatment you are on is for PCOD and the main target is to regularize the periods.The main criteria need to get a baby are :-
-proper ovulation and release of egg
-patent fallopian tubes where the pregnancy
-normal semen analysis
report of your husband.
Since you have tested i guess the semen analysis is normal ;so you will have to under go sonography
for follicular study
and if required a HSG to check patency of tubes.But still the first thing to get right is to regularize your periods.Once all the conditions are fulfilled you will conceive.
All the best.