You should seek prompt medical advice since rectal bleeding is never normal. Type rectal bleeding into google and click on to one of the many sites in order to learn more. The Medicinenet site is particularly informative. Then you will be better prepared for your medical consultation. Unless your doctor can absolutely confirm that the cause of the bleeding is minor (e.g. anal fissure, haemorrhoids etc) then I suggest that you request a colonoscopy.
Don't delay in case the blood loss causes you to become anaemic.
regards
Morecambe
also I am a 23 year old female... if that makes a difference....