Vaginal bleeding during pregnancy can cause worry. But it isn't always a sign of trouble. Bleeding in the first 12 weeks of pregnancy, also called the first trimester, is common. And most people who have bleeding during pregnancy go on to deliver healthy babies.

Still, take vaginal bleeding during pregnancy seriously. Sometimes bleeding during pregnancy could be a symptom of a miscarriage. Or sometimes bleeding might be a symptom of a condition that needs treatment right away.

Learn about the most common causes of vaginal bleeding during pregnancy. Then you'll know what to look for. And you'll know when to contact your healthcare professional.