The lightness and darkness of the pregnancy test paper at 6 weeks of pregnancy does not have much significance in determining the development of the fetus. The pregnancy test paper is only a qualitative check to determine whether you are pregnant or not, and has no use in evaluating whether the fetus is normal or not. After a pregnant woman is 6 weeks pregnant and finds out she is pregnant using a pregnancy test, she can go to the hospital for a blood test for HCG to determine the pregnancy again, and according to the HCG value checked against the number of weeks of pregnancy, the development of the fetus can be assessed. If the HCG value is abnormal, the blood HCG can be rechecked in 2-3 days to observe the doubling of HCG. Ultrasonography can also be performed at 6-7 weeks of pregnancy. Early intrauterine pregnancy can be determined if the gestational sac and fetal heartbeat are seen in the uterine cavity, and these tests can provide a more intuitive view of the development of the fetus. Pregnant women should go to the hospital for regular checkups after pregnancy, and assess whether the fetus is normal or not based on the results of the maternity checkups.