Physical reactions during early pregnancy generally have little effect on the fetus, but sex is not recommended at this time. After pregnancy, due to changes in hormone levels in the body, sexual sensitivity and libido will increase, it is normal to have a physiological reaction, generally has no effect on the baby. The vast majority of miscarriages or fetal health problems in early pregnancy are related to the quality of the embryo, and there is no direct causal relationship with sexual physiological reactions or sex. Therefore, if the quality of the embryo is good, even if there is a physiological reaction in early pregnancy, there is absolutely no need to worry too much. It should be noted that sex is not recommended in early pregnancy and regular pregnancy tests are needed to detect problems in time. If the pregnant woman has bleeding, abdominal pain and other signs of pre-miscarriage; has been diagnosed with placenta previa or symptoms associated with bleeding; has a history of recurrent miscarriage and preterm labor; and has been in a high degree of emotional stress, anxiety, or unstable state of mind, etc., then she must pay attention to the situation!