hi, my name is kimberly and i am 18 yrs old. i have been on birth control for a little over a year. my boyfriend and i had unprotected sex last saturday but i had been taking my pills regularly. the next day i missed my pill because i left it at college. 3 days later i had brownish discharge with light pink coloring. and today (4 days later) i had heavy bleeding and a little clotting. what do i do? could i be pregnant?