Hi, Irregularity in menstrual cycles can occur due to different causes. Ranging from psychological factors like stress and strain, general conditions like anemia, altered blood sugar levels, hormonal causes like thyroid abnormalities, polycystic ovarian disease, etc. Delay in periods can lead to increased thickness of the endometrium, which can lead to prolonged menstrual bleeding. To find out the possible cause of the irregular menstrual periods, she needs to get evaluated. By clinical examination and investigations like hemoglobin levels, blood sugar levels, thyroid profile, serum prolactin levels and ultrasound the possible causes of the problem can be identified and treatment can be taken accordingly. Once her cycles get regularized she can undergo ovulation induction with your doctor s advice after that the period of ovulation can be tracked either by follicular study by ovulation kits. And by planning for pregnancy in these days, the success rate will increase. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Sree Gouri S. R., OBGYN