Physiological contractions can occur after 20 weeks of normal pregnancy and can be judged by the symptoms. Some of the contractions are activity-related, such as some pregnant women who are thin and have never worked out before pregnancy, but after pregnancy they start exercising to be able to deliver vaginally normally, and when their activity increases, they can have more frequent contractions. Contractions are divided into true contractions and pseudo contractions. Pseudocontractions are only an occasional uterine contraction that occurs without regularity and without cycles. This type of contraction is more pronounced in the middle and late stages of pregnancy and is mainly felt as vague abdominal pain and discomfort after activity or after emotional or sexual intercourse, which will be relieved or disappear after rest. True contractions are more obvious, with regular and gradually intensifying abdominal pain or lumbosacral pain and discomfort, which may be accompanied by a feeling of falling, occurring several times an hour or once every few hours. At the same time, there will be an increase in the frequency of urination and the feeling of wanting to defecate frequently. If more frequent and stronger contractions occur after 20 weeks, and if abdominal pain or significant discomfort occurs with each contraction, especially if it is accompanied by bleeding or water breakage, prompt medical attention is required.