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can be due to hormonal
imbalance;anaemia;stress;and even PCOS
is one of the cause which you do not have right now.In any case you need to consult a doctor to regularize your periods.The main criteria to get pregnant are:-
-patent fallopian tubes
-normal semen analysis
of the husband.
Most of the time if these criteria are fulfilled you will get pregnant sooner or later but please consult a Gynaecoogist for further management.