See if the periods are irregular get a few tests like thyroid function test and hb and an ultrasonography
done to find out any obvious causes of irregular periods
,if any treat them after consulting your doctor.
Then regarding infertility treatment
would advice you to undergo follicular study
to know whether you are ovulating or not and you can try with ovulation induction
drugs if too keen on concieving after consulting you doc.
Normally you ovulate from either ovaries each cycle but with ovulation induction drugs as per the doctors advice,many follicles develop from each ovary so chances of ovulation and pregnancy would increase,this has to be done with follicular study and with guidance of a qualified gynaecologist or infertility specialist