After pregnancy to build a file to build a card is an important measure for early detection of pregnancy complications and timely intervention to promote eugenics, pregnant women to the hospital to build a card to pay attention to: 1, in the construction of the card is required to carry out pregnancy-related tests, such as urinary routine, blood routine, liver function, kidney function, hepatitis B three systems, ultrasound examination, so pregnant women are best in the morning fasting state to visit the clinic; 2, build a card to build a book Generally, it is carried out in community service centers or township health centers, if the business volume of these medical institutions is large, it is better to make an appointment in advance; 3. If there are recent test results, it is better to bring these test results when you visit the hospital; 4. The time to build a card is usually before 12 weeks of pregnancy, and it is recommended between 7-12 weeks.