A little pain in the stomach may not be pregnancy. The early reactions of pregnancy are mainly nausea and vomiting, along with a history of menopause and absence of menstruation for more than a month. You need to check urine HCG first, and if it shows positive, go further to the hospital for blood HCG as well as abdominal ultrasound. If the blood HCG also shows positive and the ultrasound is able to detect a gestational sac in the uterine cavity with the presence of a heartbeat, it means that pregnancy is present. If there is abdominal pain, mainly in the lower abdomen, it is possible that appendicitis is more common. In the early stage of appendicitis, the pain may be in the upper abdomen or around the navel, but in the later stage, the pain slowly shifts to the right lower abdomen and is fixed in the right lower abdomen, with a fixed pressure pain when pressed by hand. Ultrasound of the appendix is usually able to clearly diagnose the inflammation of the appendix, and laparoscopic appendectomy is recommended after the diagnosis is clear.