A headache is not necessarily pregnancy. To be precise there is no direct correlation between headaches and pregnancy. Usually women will experience menopause after pregnancy, as well as may have certain pregnancy reactions, such as nausea, vomiting, headache, dizziness, fatigue, etc. However, not all women will have the above manifestations after pregnancy, and these symptoms are not only available after pregnancy. Therefore, clinically there is no direct relationship between pregnancy and headache. There are many reasons for headache, such as staying up too late, temporary lack of oxygen in the brain, cold and flu, cranial and cerebral organic lesions and so on. It is recommended that women who have headaches for a longer period of time can undergo a cranial CT examination. And for whether pregnancy can be detected by blood human chorionic gonadotropin or urine human chorionic gonadotropin. Headache is not a clinical indicator of pregnancy.