Frequent contractions but no opening of the uterus, usually to the mouth of the uterus to open need to be in the regular contractions after 24 hours, primigravida generally need 10-20 hours, the menstruating women generally need 6-16 hours. Women who experience frequent contractions during pregnancy should pay attention to the fact that it usually takes less than 24 hours for the uterus to open, and the time varies depending on the condition of the individual body. It is worth noting that people with irregular contractions cannot accurately determine the time of opening of the uterus. It is recommended that women pay more attention to their own physical condition during this period, keep a good attitude, go to the hospital to wait for labor, and report to the doctor when there are abnormalities, so as to avoid delaying the symptoms and other serious problems.