Hi I had unprotected sex on 4th july for once my past periods were on 24 may and I did urine pregnancy test in august n september both it's negative but in september I started bleeding I thought it's period but bleeding is not proper very less its brown with some clots and the whole september I am bleeding like this and even it's october started its been 5 day n the condition is same I have no other pregnancy symptoms like fainting vomiting etc never felt like this so are there chance of pregnancy or its menstruation problem.