What Causes Brown Discharge Without Normal Menstruation?

I am 28 yrs , married, with no kids. Married a year before. My problem is ...I got brown discharge on 6th April 2010 and lasted for 3 days though my actual due date for period is 10th April. Again from yesterday (25.4.2010) i started getting brown dischage as well some blood like fluid .... what is my problem? what should i do about this? is this normal