Mid-pregnancy contractions are generally normal at 3 to 5 times a day, but there are individual differences. From the early stages of pregnancy, uterine sensitivity increases, sporadic painless uterine contractions can occur, and will gradually increase with the progression of pregnancy, the general uterine pressure is usually in the range of 5~25mmHg, the duration of less than 30 seconds, and is not accompanied by the shortening of the cervical canal, which is a normal physiological phenomenon. In mid-pregnancy, it is normal to have painless contractions about 3 to 5 times a day. But when the contractions appear more frequently, and there are paroxysmal abdominal pain, it is the symptom of preeclampsia, you need to go to the hospital in time, and ultrasound to assist in the diagnosis, a clear diagnosis of the doctor’s orders to actively preservation of the fetus treatment, but also comply with the doctor’s orders on time to review.