The 18-day delay in menstruation pregnancy test stick test is not pregnant should go to the hospital blood test, if not pregnant, consider endocrine disorders, such as the need for oral medication. 1. blood pregnancy test: 18 days delayed menstruation of the crowd, if there is a history of sexual intercourse should be the first to consider pregnancy, but the use of pregnancy tests by themselves may be due to the operation of irregularities and inaccurate results, so it is recommended to go to the hospital to do a blood test for HCG test, to clarify whether the pregnancy. 2. Drug regulation: after excluding pregnancy factors leading to delayed menstruation, generally considered to have endocrine disorders, you can improve the hormone six and other tests, you can use progesterone and other drugs to promote menstruation. It is recommended that patients with irregular menstruation consult a doctor in time to avoid blindly using medication on their own.