When a woman bleeds a little bit at 24 weeks of pregnancy, it is usually caused by preeclampsia, placenta praevia, gynecological diseases and other reasons. 1. At 24 weeks of pregnancy, a small amount of vaginal bleeding often occurs when a preeclampsia has just occurred due to the embryo or the mother. 2. At 24 weeks of pregnancy, patients with placenta praevia may experience a small amount of vaginal bleeding, which often increases with the duration of the pregnancy or even causes hemorrhage. 3. Women who are 24 weeks pregnant and suffer from cervicitis, cervical polyps, cervical cancer, vaginitis, etc. may also experience small amounts of vaginal bleeding. Women who experience vaginal bleeding during pregnancy should go to a medical institution in time to avoid delays.