The hormones in a woman’s body start to change after pregnancy, and the HCG value will change significantly after about 7 days after intercourse, exceeding the normal range of 5 IU/L. This value will grow faster, doubling every other day, which is a sign of a well-developed gestational sac. At about 10 weeks, the HCG value will reach about 100000 IU/L, which is normal. As the weeks of pregnancy grow, the HCG level will gradually decrease and reach a moderate level, and will continue to be at a moderate level until delivery. After the baby is born, the HCG value returns to normal at about 30 days, and the test result is below 5 IU/L. So during pregnancy, HCG is like a parabola.