According to the current situation, generally, embryos delivered between 28 to 37 weeks of cessation of menstruation are considered preterm. Under normal circumstances, if there is already regular abdominal pain accompanied by abdominal bloating and uterine contractions, it is generally considered whether there is a possibility of threatened miscarriage. Normally, frequent uterine contractions and abdominal hardening can stimulate cervical dilation, which generally may lead to preterm birth. Therefore, these are the signs of preterm labor. If regular abdominal pain occurs and persists for several hours without relief, it is advisable to seek medical attention promptly for treatment to prevent premature birth.