Healthwise

Implantation bleeding is a small amount of bleeding that occurs about 10 to 14 days after conception. It is thought to happen when the fertilized egg reached the uterus and implants itself into the lining. When this occurs, it can break up some of those tissues and cause bleeding. This usually occurs around the time that you would expect to have a menstrual period, although it is usually much lighter and it won't last as long. While implantation bleeding is not a cause for alarm, bleeding or spotting later in pregnancy can be a sign of a problem. If you notice spotting in your second or third trimester, tell your doctor.