earlier than thirty-six weeks call your doctor immediately. Moreover, you should also call your doctor if you have sudden bright red bleeding. Bleeding can be a sign of placenta previa or placental abruption . I did some research and found this article which I thought was pretty good: What is the mucous plug (or mucus plug)? The mucous plug is a collection of cervical mucus that seals the opening of the cervix. It keeps bacteria and infection from entering into the cervix, providing a protective barrier for the developing baby. What does the mucous plug look like? Some women describe the mucous plug as looking more like the mucous in your nose. It may look like a thick glob of stringy mucous, thicker than what you would see with normal vaginal secretions. If you are close to going into labor you may see pink, brown, or red blood around the edges of the mucous plug. This is called the "bloody show". When do you lose your mucous plug? Some women will lose their mucous plug or part of their mucous plug weeks before they go into labor. Losing your mucous plug does not always mean labor will begin shortly. Keep in mind that even if a woman has begun to dilate, it may be weeks before she actually goes into labor. However, if you notice blood tinged mucous before your thirty-sixth week of pregnancy, notify your doctor right away. As your body prepares for labor your cervix will begin to