Hello dear I understand your concern You missed period and urine pregnancy test was negative. But you did not tell about your blood HCG test. If it is negative then no chance of pregnancy because it is very accurate test o confirm pregnancy. In absence of pregnancy your missed period could be due to hormonal imbalance, ovarian dysfunction, thyroid dysfunction, excessive stress, chance in life style and dietary habit. I would suggest to consult gynecologist and undergo examination, reproductive and thyroid hormone analysis, USG scan and ovarian follicle study. In absence of pregnancy period can be induced by progesterone pill under advise of gynecologist Avoid stress, take healthy diet, drink plenty of water, do regular stretching and relaxation exercise Hope this may help you Contact further if follow up needed Best regards Dr. Sagar