How far along? If you have just concieved there is the possibility of something called "breakthrough bleeding" which happens when the fertilized egg implants on the uterus wall. This may be as light as spotting, or as heavy as a full period.
If you are more than 1 month along and bleeding, you should call your obgyn right away, or go immediately to an emergency room. If you are experiencing something that may lead to a miscarriage, there are times when the emergency room can stop you from losing the baby...
at 7:32 AM on Jan. 16, 2009