Hello dear I understand your concern You have first find the average day of your cycle. I think it could be 30-32 days but you can judge form your next 2-3 cycle. Day one is the first day of the menstrual period and the last day is the day before the next period begins. Ovulation happens about two weeks before the next expected period. So if your average menstrual cycle is 30-32 days, you ovulate around day 15th-17th. So I would suggest to do sexual intercourse during the 10th to 20th day of your cycle. Avoid stress, take healthy diet,drink plenty of water, do regular exercise and maintain proper pelvic hygiene. If you have irregular period then consult the gynecologist for detailed examination. Progesterone pill in second half of period will help in conceiving and regularize the period. Hope this may help you Contact further if follow up needed Best regards Dr. Sagar