Hello dear I understand your concern Your irregular period is not due to pregnancy as you you got period after the sexula intercourse. Delayed period could be due to hormonal imbalance, polycystic ovarian syndrome, thyroid dysfunction I would suggest to consult the gynecologist and undergo reproductive and thyroid hormone analysis, USG scan, ovarian follicle study. Specific treatment will depend on the cause. Doctor will prescribe progesterone pill/shot to induce the period. Birth control pill will help to regularize the period Avoid stress, take healthy diet, do regular exercise, drink plenty of water. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar