Pregnant women do not need to have blood drawn for every checkup, but still need to decide whether or not to have blood drawn depending on the checkups needed for different pregnancy weeks. In early pregnancy, pregnant women need to draw blood to check the blood HCG value. After determining early intrauterine pregnancy, blood needs to be drawn for liver and kidney function, blood routine and other tests. After that, Down’s syndrome screening or non-invasive DNA test is also needed. Pregnant women undergo 1 maternity test in the month before the 28th week of pregnancy, so blood draws are usually available in the corresponding week of pregnancy. After the 28th week of pregnancy, pregnant women have many fewer blood tests, and the pregnancy test time is changed to 1 time in 2 weeks. In addition to routine blood tests, pregnant women also need liver function and serum bile acid tests at 32-34 weeks. After 36 weeks of pregnancy there is no special need for blood tests, and the pregnancy test time has been changed to 1 week, so there is no need to draw blood for every pregnancy test. Pregnancy test is not every time to draw blood, according to the maternity program and the personal situation of the pregnant woman to decide the time of drawing blood, pregnant women should do a good job of regular obstetric examination.