hi im about to turn 18 and been on the pill for about 7 months, but i have never been really good on taken them on time and sometimes for get, but it really has never done anything, like early bleeding or anything to me, until last month. about 4-5 days after having unprotected sex with my boyfriend i started to bleed brown pink blood ( did i say i missed two pills the week before i had sex and never took them), well i took two pregance test and both where negative, i also had my period that month. however, a week before i was to start my period this month brown blood, again. i was to start my period this week but i havent, on wednesday it will be a week late. could i be pregant or is it just old blood?