The best time for the first pregnancy test for a second child is about 5-7 weeks. The purpose of the first maternity test is to determine the location of the gestational sac and its growth and development. Usually, it is possible to determine intrauterine or ectopic at 5 weeks of pregnancy and to see the fetal heartbeat and germ at 7 weeks of pregnancy. During this period, if a pregnant woman experiences abdominal pain with abnormal bleeding or has a history of abortion or ectopic pregnancy, an early ultrasound examination is needed to determine the location of the gestational sac and to rule out ectopic pregnancy. If there is no discomfort after the pregnancy is discovered until the 7th week of pregnancy, you can wait until the 7th week of pregnancy to directly see if there is a fetal heartbeat. It is often necessary to check the blood HCG and progesterone during the first pregnancy test. Based on the HCG value and progesterone, we can initially determine the development of the fetus and further clarify whether the fetus needs to be treated with fertility preservation. In addition, it should be noted that regular maternity checkups are needed during pregnancy, and the actual week of pregnancy can be calculated based on the ultrasound of the first maternity checkup to provide accurate examination time for the subsequent maternity checkups.