The HCG doubles every other day after pregnancy if the embryo is developing normally, but some people have two or three day intervals, and the interval is different for each person, but the interval is not too long. If the HCG does not double or the value does not increase after three days, it is considered that the fetus is underdeveloped or there is a possibility of miscarriage, and ectopic pregnancy cannot be ruled out, so it is necessary to have regular blood tests for HCG in early pregnancy, and at the same time, you can go to the hospital for gynecological ultrasound to check the development of the gestational sac. If the HCG and progesterone are low through blood test, it is recommended to take progesterone under the guidance of the doctor to regulate the pregnancy, and it is also recommended to supplement vitamin E reasonably to prevent miscarriage. In early pregnancy, the fetus is unstable and should not be overworked. It is recommended to take reasonable supplement of folic acid.