It is not normal to have painful diarrhea in early pregnancy. You should pay attention to check and distinguish whether the pain is caused by diarrhea. If you are sure that the stomach pain is caused by diarrhea, you should treat it promptly. If the diarrhea is particularly severe, it may lead to uterine contractions and cause the possibility of miscarriage. If you have stomach pain, you should also pay attention to rule out whether the stomach pain is caused by miscarriage or ectopic pregnancy, both of which require timely examination and treatment. If the stomach pain is caused by the aura of miscarriage, progesterone should be checked in time to determine the low progesterone level, and progesterone supplementation should be administered in time for fetal preservation treatment. If the stomach pain is caused by ectopic pregnancy, you should take timely treatment measures and use conservative treatment in the early stage, but if it is more serious, you should take timely surgical treatment, otherwise it may be life-threatening at any time.