How long before you see red in the second trimester?

Redness in the second trimester of pregnancy is a sign that the fetus will be delivered in about 48 hours, but this varies from person to person.
Redness is regarded as a precursor to labor. Once redness occurs in late pregnancy, it means that the fetus is about to be delivered, usually within 48 hours, but it varies from person to person, and in the case of menstruating women, the delivery time will be shorter. If it is accompanied by regular contractions, shortening of the cervical canal, dilatation of the cervical opening and other manifestations, it means that it has entered the stage of labor, and should be immediately hospitalized for delivery.
It is recommended to consult the hospital as soon as possible after seeing red, complete the fetal ultrasound, vaginal examination and fetal heart rate monitoring and other related examinations to clarify the progress of labor, and under the guidance of the doctor for further treatment.