A minor spotting or light bleeding during pregnancy is nothing to worry about for most women. It's often one of the early signs that you're pregnant. However, heavy bleeding or bleeding that lasts for more than a few days could be a sign of a severe problem. Here's what you need to know about vaginal bleeding during pregnancy. When Is Bleeding During Pregnancy Normal? Spotting is any light bleeding from your vagina without regular menstrual periods. In most cases, it lasts for a short time and goes away. During the first trimester, it's normal to have some light spotting or bleeding after sex or while you have a Pap smear. Light bleeding during early pregnancy is relatively standard. About 20 to 30 percent of pregnant women experience some bleeding during their first trimester. What Causes Vaginal Bleeding in Early Pregnancy? In most cases, light spotting or bleeding during early pregnancy is caused by the embryo's implantation into the uterus lining. This is also c...