The difference between chest pain before vacation and early pregnancy chest pain is: the regularity of chest pain is different, the duration is different, and the accompanying symptoms are different. 1. Different regularity. Chest pain before menstruation has a close relationship with menstruation, each time about a week before menstruation, there may be chest pain. Early pregnancy chest pain has no clear regularity. 2. Different duration. Chest pain before menstruation may disappear at the end of menstruation. Early pregnancy chest pain is usually around 3-4 weeks of pregnancy. 3. Different accompanying symptoms. Chest pain before vacation may be accompanied by abdominal pain, menstrual cramps that worsen progressively, and other symptoms. Early pregnancy chest pain may be accompanied by nausea, vomiting, tiredness, appetite changes and other symptoms of early pregnancy reactions.