Thanks for the query.
As your cycles are irregular it is difficult to estimate the period of ovulation.
So you once consult gynecologist and check for pregnancy
If the pregnancy is rule out, you can go for ovulation induction
in the next cycle with your doctor's advice.
And after that you can follow the ovulation with follicular study
Then plan intercourse around the ovulation, which will increase the possibility of pregnancy.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429