The recommended time for preconception checkups is 3-6 months prior to pregnancy preparation. First of all, the preconception tests for women include the four eugenics tests, ultrasound, gynecological examination of vaginal secretions, etc., as well as tests for hepatitis and infectious markers. For men, the tests include semen routine, urethral secretions and infectious markers, and if there is any abnormality in these tests, it will take some time for human intervention and treatment. If there is an abnormality in herpes virus or rubella virus in the four eugenic tests for women, it will take some time for treatment and review. If a man is found to have poor sperm motility, low sperm count, etc. during the preconception test, the treatment period for this condition is also longer because the sperm production cycle is 90 days, so treatment should be started at least 3 months in advance. If the examination is performed 3-6 months before the preparation for pregnancy, there is sufficient time to prepare and adjust the body to the best state of adaptation. It is also recommended that women should start taking multivitamins and folic acid supplements 3 months before conception, so it is recommended that you should allow sufficient time to start the pre-conception preparation at least 3 months before conception.