Usually, early pregnancy reactions can occur around 6 weeks of pregnancy, but the situation varies from person to person. Early pregnancy reactions have significant individual differences, as each person has a different sensitivity to elevated blood hCG. If a pregnant woman is sensitive to elevated blood hCG, she may have an increase in blood hCG after 10 days of intercourse and have an early pregnancy reaction. If you are not sensitive to hCG elevation, the early pregnancy reaction will appear relatively later. Some pregnant women are even completely unaffected and do not have any early pregnancy reaction, which is usually normal as long as the gestational sac develops normally. Early pregnancy reactions usually manifest as nausea, vomiting, drowsiness, frequent and urgent urination, etc., which are related to individual’s constitution, and the development of the fetus cannot be judged simply by the presence or absence of early pregnancy reactions. The presence or absence of early pregnancy reactions or their severity during pregnancy is mostly normal, and regular maternity checkups are generally sufficient.