Hello dear I understand your concern Most common cause of the delayed period in sexually active women is the pregnancy. Delayed period by the 30 days is not normal. Nausea and vomiting is not most common symptoms of the pregnancy. I would suggest to go for urine pregnancy tests and or blood HCG to confirm the pregnancy. If you will be pregnant then it will terminate by abortion pill under the advice of gynecologist. Other cause of delayed period in absence of the pregnancy are: Hormonal imbalance, fibroid, endometriosis and ovarian dysfunction. For that consult the gynecologist and go for proper evaluation. Period is induced by the progesterone pill in absence of the pregnancy. Avoid stress, take healthy diet and do regular exercise. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar