Regular contractions. How often?

about regular contractions how often? Regular effective contractions are more than or equal to three contractions within ten minutes, each lasting more than or equal to 20-30 seconds, and accompanied by shortening of the cervical canal and dilation of the uterine orifice. Moreover, the interval between two contractions is getting shorter and shorter, and each contraction lasts longer and longer, showing regular contractions, indicating that labor has entered the city. In this process, pregnant women should eat a good rest and eat a light diet, eat less and eat more meals, maintain a good mentality, pay attention to rest. If you show red, or vaginal water and other performance timely communication with the doctor.