okay so i had sex on about Sept 11th and then i had my period on Sept 30th so i thought i was okay. But approximately two weeks after i ended my period i had a brown discharge for about a week, it was light.   I just ignored it and waited for it to go away. Then i was suppose to have had my period Oct 30th which i have not and it is Nov. 2 today and I am currently 3 days late. Do i have anything to be worried about? ive been stressing about this a lot so could that be why i am late? i haven't been having any signs of a pregnancy either except for little headaches here and there but the weather has been changing and that causes me to have headaches.