After 12 weeks of pregnancy, there is no need to check the three pregnancy items, there are no abnormalities within 12 weeks of pregnancy, there is no need to check the three pregnancy items frequently, whether it is necessary to check the advice of the doctor to follow the implementation of the recommendations. The three pregnancy tests are HCG test, estrogen, progesterone and other three values of the test, 12 weeks of pregnancy blood test these items, can understand the embryo in the uterus development is good, for example, blood test HCG will be doubled every other day growth, indicates that the embryo is well developed, HCG does not double or slow growth, indicates that the embryo is not well developed. Pregnancy 8-10 weeks the placenta function is established, gradually no longer need ovarian progesterone support, after 12 weeks of pregnancy, the fetus in the uterus development is more stable, the body’s hormone level tends to stabilize the state, there is no need to check the three pregnancy, you need to do other tests, NT, Down’s syndrome, liver and kidney function, four-dimensional ultrasound, blood test and other items, to understand the situation of the pregnant woman and the fetus. After pregnancy, do a good job of regular pregnancy checkups, follow the doctor’s instructions, there are abnormalities can be dealt with in a timely manner.