Auntie feeling refers to the feeling a woman gets when she has her period. The feeling of menstruation in 31 weeks of pregnancy is usually caused by contractions and fetal movement. 1. Contraction: it means uterine contraction. It is a physiological change caused by the contraction of the smooth muscle of the uterus. Contractions can be divided into regular uterine contractions and irregular uterine contractions. They usually appear in the 28th to 32nd week of pregnancy and are characterized by hardness and tightness of the stomach, accompanied by pain in the lower abdomen. It leads to the feeling of menstruation in pregnant women. 2. Fetal movement: It is the movement of the fetus in the uterine cavity impacting the uterine wall. Fetal movement is usually most noticeable during the 29th to 32nd week of pregnancy. Fetal movement is one of the important elements in the clinical prenatal fetal heart rate monitoring technique. The number, speed and intensity of fetal movements indicate the well-being of the fetus. It may cause the illusion of menstruation. It is recommended to go to the hospital for timely checkups and regular obstetric checkups to avoid the adverse consequences of misjudgment.