The majority of pregnant women will experience labor pains within 24-48 hours after the second trimester, with a few taking up to a week. If a pregnant woman experiences painful uterine contractions at the beginning of labor, which is customarily referred to as “labor pains”, most pregnant women will experience labor pains within 24-48 hours before labor, i.e. 24-48 hours after the second pregnancy. The timing of the onset of labor pains may vary because of the differences in the physical condition of pregnant women. Some pregnant women with second pregnancy have relatively fast labor progress, and some of them can show symptoms of labor after 37 weeks of pregnancy, so they need to be sent to hospital in time after seeing red. If the “labor pains” do not occur for a long time, it may be due to mental tension, so you need to tell them to relax. In addition, it should be noted that if a pregnant woman has more vaginal bleeding than her daily menstrual flow, it should not be considered as redness, but should be alerted to exclude late pregnancy bleeding, such as placenta praevia.