Different women around the world experience different conditions during pregnancy. This is because your physical metabolism chalks out your pregnancy conditions.
Some women do experience discharge or bleeding during their pregnancy. Most of these women have this kind of discharge at early stages of pregnancy around the time they are supposed to have their periods. If you are in your early stages of pregnancy then it is not a cause of concern. However, if you are in your later stages, then bleeding can mean a number of problems like an infection, a miscarriage etc. So its best if you can consult a doctor.