i had protected sex. i started getting really worried and paranoid and had alot of stress . my period after the protected sex was light and i had brown spotting for about 6 days. the next month i had a normal period , it lasted a week ( like all my others ) and was bright red & i bled alot -same as always. the next month was the same .. normal period., now this month im a day late? help! i dont have any symptoms of being pregnant i just dont understand my cycle of periods.