Thanks for your query.PCOD
is often responsible for irregular cycles.
Due to basic underlying hormonal
imbalance, the ovaries are studded with multiple follicles, but none mature to form a mature egg.
So problems in menstruation
and ovulation arise.
You have not specified what kind of injections, however antibiotics should never be taken continuously.
FOR PCOD, consult a gynecologist, and have complete hormonal evaluation and workup.