If there are still gastrointestinal reactions, such as nausea and vomiting, in the early stages of pregnancy, it can overwhelmingly indicate that the fetus is developing well in the uterus, and it can also indicate that HCG levels are increasing. However, this does not indicate that progesterone is normal, so if lower abdominal pain or vaginal bleeding occurs, it is recommended that not only a blood HCG test be done, but also a progesterone test to see if progesterone is normal. If progesterone is low, clinical intervention is needed. This is because the smooth muscle of the uterus may contract when the progesterone is lowered, which may lead to preeclampsia, and it is recommended that progesterone supplementation should be given in time to improve this symptom.